Not sure if this will help but anyways...
I have an MSD blaster High Vibration coil, and a bypassed computer ignition on my 87 YJ. My tach didn't work until I ran a wire from the tach side of the coil and spliced it in behind my tach to the original wire. Works fine now. Need any more info just ask.

1987 YJ Laredo
Rylan D.

 

Will, I have an MSD box and a stock Jeep tach. I had to get a tach adapter from MSD to keep the " run-on" from occuring. Seems as though run-on is when the tach keeps juice to the MSD box and by passes the ignition. When I first installed the tach to the MSD box (silver wire) the tach worked great. Then after trying to turn my jeep off it would not turn off!!! When I reved the engine the tach quit working, then that broke the circut and then I was able to turn off the jeep. I could re-start the jeep the tach would work then rev it up and it would quit again. I got that tach adapter and have not since had a problem. The adapter does buzz. Still can not figure that one out...seeya...

CJ-7,401,T-18,Detroits,etc..
http://hometown.aol.com/ericselz/myhomepage/profile.html

 

Call MSD's Tech line.
Info is free, all you pay for is the phone call.

Tech Line 915-855-7123
Rick seems to be the sharpest knife in the drawer.

Usually, they can help right away. Rick will call you back if he needs to do research.


"I Have The Body Of A God... Buddha"