scannon Posted February 24, 2016 Share Posted February 24, 2016 I'm done with the Caterham Caerbont speedometers. Looking at GPS speedometers but I can't find one to fit the 3.25" hole in the dash. Closest I've found so far is 3 3/8". Anyone know of one that will fit the hole? I'd rather not enlarge the hole in the dash and can't think of an easy way to do it other than a file. If I do enlarge the hole I'm liking this one: http://www.speedhut.com/gauge/GR338-GPS-01/1/GPS-Speedometer-Gauge-120mph Link to comment Share on other sites More sharing options...
FE07 Posted February 24, 2016 Share Posted February 24, 2016 Skip, I replaced mine with a Speedhut 3 3/8" and it works great. Had to slightly enlarge the hole in the carbon dash. Used a dremel with a sanding disc and just kept trial fitting. Tried to find my receipt to tell you exactly which model it was but can't find it at the moment. Just tried to match up the bezel and font as closely as I could. Hard to tell it's different. Kind of fun since you can record 0-60 times with it. Gives you altitude, trip odometer, time and speed digitally as well. If you let them know, they can preset it with mileage on the odometer to keep it accurate. I put the wire for the antenna through the hole where the windshield washer was mounted. Filled that hole with a black plastic plug which I slotted and then filled in with a little black permatex. My car has a central black stripe on it so the antenna blends in on top of it infront of the windshield. Let me know if you have any questions. Jim Link to comment Share on other sites More sharing options...
NVP66S Posted February 24, 2016 Share Posted February 24, 2016 I used this VDO one from North Hollywood Speedometers. http://www.vdo-gauges.com/instruments/by-type/speedometer/cockpit-120mph-3-1-8-electronic-speedometer-with-autocalibration.html They have 3 1/8 and 3 3/8 but no 3 1/4 as far as I can tell. The 3 1/8 probabaly has a bezelbig enough to cover your hole, but you can call them and ask. Since my scuttle is fiberglass, I just mounted the GPS antenna on the top of the instrument cluster and it works fine. dan Link to comment Share on other sites More sharing options...
scannon Posted February 24, 2016 Author Share Posted February 24, 2016 I used this VDO one from North Hollywood Speedometers. http://www.vdo-gauges.com/instruments/by-type/speedometer/cockpit-120mph-3-1-8-electronic-speedometer-with-autocalibration.html They have 3 1/8 and 3 3/8 but no 3 1/4 as far as I can tell. The 3 1/8 probabaly has a bezelbig enough to cover your hole, but you can call them and ask. Since my scuttle is fiberglass, I just mounted the GPS antenna on the top of the instrument cluster and it works fine. dan That and the other 20 speedometers they list are all electronic. I'm going with GPS this time. Link to comment Share on other sites More sharing options...
Kitcat Posted February 24, 2016 Share Posted February 24, 2016 (edited) My Garmin GPS shows my speed, among other things, and that's what I used to determine mph on my street se7ens. After a while I knew what mph the rpm's corresponded to and just guess-timated speed. My Birkin's speedometer never worked and the Caterham's was off by 5-7 mph, when it was working at all. On my current track-only Cat, mph is pretty academic. My Garmin will tell me what my top speed was on any given run, so I know what I am pulling at end of the straight. When I am 10 mph slower than the guy I couldn't catch, that helps explain why (As does learning that I was 10 mph faster:)). Edited February 24, 2016 by Kitcat Link to comment Share on other sites More sharing options...
scannon Posted February 24, 2016 Author Share Posted February 24, 2016 My Garmin can't come close to keeping up with the car's acceleration. It pauses then jumps 10 or so mph then repeats until speed stabilizes. Its always a few seconds behind. In the Caterham with the top down and the sun shining its almost impossible to use it as there is no place in the cockpit to get it out of the direct sun and still be able to see it from the driver's seat. It doesn't have enough volume to be heard over wind and engine noise when its giving directions. Link to comment Share on other sites More sharing options...
NVP66S Posted February 24, 2016 Share Posted February 24, 2016 That and the other 20 speedometers they list are all electronic. I'm going with GPS this time. Yes, they are all electronic. They accept inputs from either the GPS sensor, Hall effect, or reluctance sensors on the tail shaft. I used the separately purchased GPS sensor with mine and it works well. It takes about 2 sec to catch up with acceleration. In a tunnel, it displays the speed when signal is lost, then reacquires in about 2 sec after leaving the tunnel. I opted to not power it with the engine OFF, and it takes about 30 sec to acquire the satellites after cranking the engine. Link to comment Share on other sites More sharing options...
scannon Posted February 24, 2016 Author Share Posted February 24, 2016 The description doesn't say it works with GPS. I looked under sensors and found the GPS unit. It costs more than the speedometer. It also says you can attach the sensor to the back side of the speedometer but I doubt it could pick up signals through the aluminum cowl. Its biggest advantage is the 80mm size, no cutting of my dash panel. The Speedhut unit has more features and costs nearly $100 less including the antenna and you can customize the bezel, pointer, back ground and text colors. http://www.speedhut.com/customizer.i?sku=GR338-GPS-01 The downside is it needs an 85mm hole and the hole in my dash is 82mm. Link to comment Share on other sites More sharing options...
MightyMike Posted February 25, 2016 Share Posted February 25, 2016 Skip, I have the Speedhut GPS speedo you mentioned, except mine reads 0-200 mph. It is always accurate. I really enjoy being able to pull up the time, altitude, 0-60 and 1/4 mile times. I highly recommend it. Link to comment Share on other sites More sharing options...
Sean Posted February 25, 2016 Share Posted February 25, 2016 Suggestion: Maybe attach a GPS speedo intended for a bicycle as a supplemental speedo, leaving the current one in place. Then you have accuracy without cutting anything. They're much less$$ to buy as well, and quite accurate. Just make sure to get one that is able to read speeds over 60mph, as many don't. Search 213-04.com for bike speedo for more detailed information, if interested. Link to comment Share on other sites More sharing options...
scannon Posted February 25, 2016 Author Share Posted February 25, 2016 Suggestion: Maybe attach a GPS speedo intended for a bicycle as a supplemental speedo, leaving the current one in place. Then you have accuracy without cutting anything. They're much less$$ to buy as well, and quite accurate. Just make sure to get one that is able to read speeds over 60mph, as many don't. Search 213-04.com for bike speedo for more detailed information, if interested. When I first put the car on the road I did just that. I couldn't get the original speedometer to work with the Miata transmission's electronic sensor so I put a bike speedo on it. The big problem with that was it stopped registering at 50 mph. I am close to pulling the trigger on the Speedhut GPS speedometer. Link to comment Share on other sites More sharing options...
Kitcat Posted February 25, 2016 Share Posted February 25, 2016 Sean: What is 213-04.com? When I google that I get gibberish. Link to comment Share on other sites More sharing options...
scannon Posted February 25, 2016 Author Share Posted February 25, 2016 When I put it in as a URL I got Blatchat but no info on bicycle speedometers so I searched Blatchat for bicycle speedometer and got no hits. Link to comment Share on other sites More sharing options...
Sean Posted February 25, 2016 Share Posted February 25, 2016 (edited) KC - Historically, it used to be the Blatchat back-up or mirror site as some office systems would block Blatchat, probably due to "chat" being in the URL. After Blatchat was killed off with the new site in its place, 213-04 was retained, but as search only - one cannot post to it, but searches can be done, and unlike the new L7 Club forum, the links still work. Very useful, but one day soon they will pull the plug on this site as well. Go here: http://213-04.com/ Click on "Search" beneath the word "Club" From the "Search topics updated:" pull-down, select "Since the beginning" ...the rest should be self-explanatory; something to do with Bob's uncle or similar. SC - You got no hits because you forgot to search in "English" Try again searching for "bike speedo" (returns 373 topics as individual terms and 273 as the exact phrase, as opposed to zero hits for "bicycle speedometer"). Even searching for the phrase "GPS speedo" got 35 hits. Mixing terms gets different quantity/accuracy of results, but "Holux", "cyle", and "computer" would be some other good terms to use to narrow it down. I saw one thread where the Holux GPSport 245 had been successfully tested by the purchaser on foot, car, and 747. There are definitely bike speedos that register above 100 mph, as that is discussed in some of the threads, such as this one. Also a write-up by Myles on his site about his installing a wired unit here. Happy hunting! Edited February 25, 2016 by Sean Link to comment Share on other sites More sharing options...
locost7018 Posted February 25, 2016 Share Posted February 25, 2016 I've seen Skip drive. He is going to need a speedo that reads a LOT more than 100!!!!!!!!!!!!!!!!!!!! Link to comment Share on other sites More sharing options...
xcarguy Posted February 26, 2016 Share Posted February 26, 2016 Skip, What you have is merely a minor mechanical issue. This, however, is a speedo fail . . . . :svengo: Link to comment Share on other sites More sharing options...
scannon Posted February 26, 2016 Author Share Posted February 26, 2016 Arrrrrg, what has been seen cannot be unseen. :puke: Link to comment Share on other sites More sharing options...
MightyMike Posted February 26, 2016 Share Posted February 26, 2016 Did you really have to do that Shane? Link to comment Share on other sites More sharing options...
Croc Posted February 26, 2016 Share Posted February 26, 2016 Yet another day on the red neck Riviera.... :nopity: On the plus side Skip, I can confidently say that will not fit your dashboard! :smash: Link to comment Share on other sites More sharing options...
scannon Posted February 26, 2016 Author Share Posted February 26, 2016 I don't think he would fit in the car. What I really think happened was Shane gave that guy a ride in his Se7en and that's what flattened the frame, not some trumped up agricultural expedition at the track. :jester: Link to comment Share on other sites More sharing options...
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