Have a factory tach who fixes them. Think i wired it right and it does not work. Any help would be great!

I would look on the internet for companies that repair stewart warner insterments...

Try "TACHMAN" they are experts in the gauge restoration business.

John C

the one thing that I can say about those factory tachs is that they are VERY FRAGILE!! If you buy one off of the internet, be careful that it is insured, as a lot of them that worked before don't work when received....