| Strange LT1 Tach problem- works until 4200rpm, then goes to zero
| I have a 1995 LT1 swapped into my T/A. I've tried two 3rd gen tachs now, with the same result. I've used a 8000 RPM tach from an L98 car that I know for certain worked perfectly with the original L98, and I've also used a 6000RPM tach from a 305 TBI car. For both, I will slowly accellerate and the tach will move up smoothly until 4200 RPM, then it drops off the table to zero and stays there until I drop below 4200 RPM again. The engine doesn't get choppy or anything when this happens, it appears to just be the tach that acts funny. Does anyone know what is causing this? | | |
__________________
Bright Platinum Metallic with painted hoodbird, 17x9 Year One Snowflake Wheels, smoothed inner fenders, shaved door locks and antenna. Black leather interior.
Current Drivetrain: LT1 and T56 with SLP 1 3/4" primary headers and catback, Borg Warner 9-bolt.
Coming soon: rear gear swap! | 
