sw tach/6al/painless wiring how to? Help

[nymathboy]

I now have the purple wire in the picture going to the SIG post.

In the engine bay I have the purple wire going to the negative on my coil.

I have a keyed positive power wire going to the POS terminal

I have a ground wire going to the NEG terminal



When I turn my car on I can tell that the tach is getting power because I see the needle move but it never gets past zero. The needle moves to zero and stays there even if I rev the engine.

[nymathboy]

I figured it out.

First. give up on the idea that you can hook up your tach to the coil. I tried it several different ways. I even called up SW and they said that with certain coils you hook up the SIG post to the + side of the coil which I never heard before. I always heard that you hook up the SIG post to the negative side of the coil.

For what it is worth here is how it is done:

1. Make sure the pins on the back of the TACH are set up for a V8 engine.
2. If you have a MSD 6AL ignition box, there is a male spade connector on one end of the MSD box. Hook that directly to the SIG post on your tach.
3. The AUX post is not used
4. Connect the NEG to a good ground
5. Connect the POS post to terminal at your key switch which will remain hot when you turn your engine on. This is easy if you use a test light to figure out which is hot at the key.