I installed a pertronix system in my 71 442 w/455, works great but my vintage tach doesnt work ..Help what to do?

 

I'm thinking that a fused line from the tach (factory tachs use a 2 amp fuse)to the negative side of the coil, plus a good ground for the tach, would do the trick. I've got pertronix in my '68 4-4-2 and that's how the factory tach is connected. My factory tach works great.


Randy C.

 

What "vintage tach" do you have?

I thought all electrical tachs work off the signal on the coil and since the Pertronix is merely a transistor switch instead of a mechanical switch there shouldn't be any difference as far as the tach is concerned.

 

Do you have it connected to the distributor side of the coil ( coil neg terminal)? Does it have power and ground?