I could never quite understand this problem as my original 68 hood tach that was on my Bird worked with all of the following and never an issue: HEI dist. (on the car when I bought it), I then went to a stock dist. w/points, stock dist. w/Pertronix Ignitor II, MSD dist. w/MSD box.

Now with the LeMans I bought a repop hood tach for a 67 (tall tach) and installed with the original dist. w/points and it worked fine. Now I have replaced the original dist. with the new MSD plug & play HEI dist. that looks like a stock dist. with stock appearing black cap and the repop hood tach works with that as well. Not sure why some people have a problem and others don't.

Now, in saying that the new repop hood tach works with my new MSD plug & play dist. I will say that sometimes when you first start the car, the tach does nothing, the needle is burried below 0. Then, after a few seconds it pops up and works fine. Sometimes it will take up to a couple of mins. or if you tap on the top of the tach it works fine. 7 out of 10 times it works fine without any delay, the other times I just take off and then it starts working. Almost seems like it needs a bit of juice to get it going.

Also, the fused link from the hood tach, does in fact go to the (-) negative terminal on the coil...