I have a 94 Z. The problem normally shows up in first gear. Basicly when the car is WOT in first gear the tach will rise up to about 5500rpms and then just smack over to 7000. I know for sure the motor isnt going to 7000, just the tach. Currently the car has a TH350 trans, but with the previous 6 speed it had the same problem. On motor it is normally fine, but on spray it happens probably 7 times out of 10. Any ideas?

Thanks

 

anyone?

 

A little up date on the problem. I hooked a Auto Meter tach up to the tack output on my MSD 6a. The Auto Meter tach read purfectly. Doesnt the MSD get the same signal as the computer for RPMs? Is there anyway I can hook the wire from the MSD tack output up the to the input on the computer?

 

That only happens to me when i hit the rev limiter, only done it twice, both times were accidents.

 

The car is def not hitting any kind of rev limiter.

 

Ok hear is a little up date on my problem. Apparently im the only one that has ever had this problem. So, I decided to hook up the factory tach to the tach output on my MSD 6a. This did not solve the problem. My factory tach and the autometer tach were getting the same exact signal and the factory one was still off. So I figured it had to be something wrong with the factory cluster. I just got a different gauge cluster and put it in to make sure my old one was bad and the new one does the same thing. Lastly I cut the gauge cluster ground wires and re grounded them to a different known good ground to see if that would help. Still no change.
Does anyone have any guesses????????????