Tach dip switches

[Geowiz]

I need to change the dip switch settings on my brand new build with Smiths tach. Can anybody walk my thru this?0

[MV8]

WIth a four cylinder and a distributor it is sw 1, 2, and 8 on. With coil packs, it is 1, 3, and 8 on. 8 is always on.

[Geowiz]

That is great, but how do I get to it?

[MV8]

There is a grommet/plug backing that is pulled out to access the switches.

[Geowiz]

The big plug at the top?

[MV8]

Yes. Get under the edge with a butter knife, then lift the knife away from the tach.

Edited July 25, 2025 by MV8

[Geowiz]

Do I need to remove the tach to do this?

[Geowiz]

Another stupid question: what holds the tach in place?

[MV8]

The tach body is threaded. The thin, outer plastic ring is a long nut.

Should be able to unplug the wiring connector, unthread the ring from the tach body, and pull it straight out of the panel. No tools required except may when trying to squeeze the black clip on the wiring connector to release it.

Edited July 25, 2025 by MV8

[Geowiz]

Thanks! That is the info I needed. I thought it was screwed in, but I needed to make sure I didn’t break anything. I will need to remove the steering wheel.