ok so right now i have the car running with the old tach and its all bouncy. i was told the upgrade would sort of fix it or make it less since the distributor is a electronic from the zx. I do have the L28 and the current 240z tach does not read the rpm's that well since it was designed for the L24. so i can just leave it as i currently have it and just run another cable from the neg (-) side of the coil to the terminal on the tach. Thanks Edit: Thanks I got it working. all I need to do is run a cable back to the dash and im all set. thanks again for replaying. out of 4 different post on 4 different sites this is the only one i got a reply back.