Tman312

Hello,

So, I just hooked up a Sun Super Tach II to my z28 and when it is grounded, the tach. pins past 8k rpms. Once I un-ground it, it drops back to zero.

The light works, and it must be getting power because it did move.

This is how its setup:

Ground is grounded to body

Signal is from the white wire on the coil

Light is straight from battery, but has a switch to toggle on/off.

Power is straight from battery

What could be wrong?

JakeRobb

Two thoughts come to mind: bad ground, faulty tach.

Tman312

Well...Ive taken the ground wire and touched it at different places, with the same result. (even the battery ground post.

The tach is old, my uncle gave it to me a while ago and I think he had it in storage for years after buying it from a garage sale or something..

Any other possibility?

Thanks for the reply.

Tman312

Ok. Well, switched the power wire and signal wire. Now the tach will stay at 0 until i turn the key to on or when I start it. The tach moves a bit, but I think I have the wrong wire spliced on the coil.

There's a white and black and a pink and black one I think, its spliced into the white one. Is this correct?

2.8l V6

frankzlt1

Green wire goes to the coil black wire is your ground red to the 12v blue to the back light.

Tman312

Yes I know but on the coil wires, which one do you get signal from?

Tman312

bump