Well, I put a MSD 6A box in. Seems to pull harder topend, but thats when my tach screws up. I already did a search on here and found out about the tach adapter for $25. MSD says I just need to bypass my "filter". Where is it at? Some guys said this is all they had to do on their '89-'92 cars to get the tach to work right. Please help!

 

TTT.... anyone?????????????

 

if you have or can access a good wiring diagram it can tell you where it is at, just a guess but it would most likley be on the back of the guages somewhere. maybe a GM tech at your local GM dealership can tell you

 

I've heard its located on the firewall. Somewhere behind the distributor maybe?
Later Barrett

 

I've searched my car for the mysterious tach filter, never found it. I think its in the Bermuda Triangle. I'd say so is yours.

Save yourself the headache of trying to find the non-existant filter (which in real life looks like a condensor for a points setup... oh, probably dont know what that is... Well, a tiny soda can about 1/4" diameter).

 

So where is this thing????

 

They were probably referring to the capacitor in the distributor, it is supposed to be there to eliminate RF from the dist.