Some how I got two wiring harness plugs with my hood tach. One is a cheap one that just has three long wires.(must have came with the tach) and the other is a fancy one that has plugs and fuse holder. Is there a drawing any where on how this is wired and routed? BTW what size fuse does this take?

one wire is a ground one for lights and ione goes to the coil I cant remeber what fuse it takes..If anyone needs a template for the hood tack hole let me know..

Keep in mind that the "fancy" one will not work with new reproduction tachs. I just ran into this myself. I had to use the "cheap" one for it to work.

Here's the Illustration from the manual:
http://1968firebird.org/illustrated/misc/antrad1.html

It at least shows the stock wiring...

Brett - 67 Drop Top 455!

That sucks that I can't use the fancy one. I will study them a little and see what I can figure out.

here is a pic of the two wiring harnesses

http://community.webshots.com/photo/146303668/184834305szGbSL

Yea, mine look exactly like the two you have. I had to use the crappy looking one (the one that looks like I could have built it myself, and that's not saying much). I called both Ames and Classic Ind., and they both said the new repro tachs could only be used with the cheap harness.

There is an inconsistency with this though. If you look on the Classic website, they say that the nicer harness can be used on original OR REPRO tachs. But, I can tell you, it doesn't work on the repros for sure. When I called their tech support, he clearly said the nicer harness will NOT work on repros - the inner electronics are different.

I think the reason they say that in print is because they have a no return policy on there wiring.
I'm still going to study the two and get my volt meter out see if I can use some of it. They are just wires what electronic would be in it? I would like to use that adapter for the washer pump and the fuse holder.

Have you guys looked at these harness' from
http://www.thepartsplaceinc.com/newproducts.asp?curpage=18

(3rd down on the page) this sounds like it works with stock OR aftermarket hood tachs? And it works with the dimmer for the headlights.

Just ran across it and thought it may be worth looking into, or even calling to find out more?

If you do investigate, let us know!

Thanks - Brett - 67 Drop Top 455!
(my hood tach has stopped working now! Doh!)