Tachometer Issue - ZR-1 Net Registry Forums

Dynomite · 4 Weeks Ago

Tachometer on 1990 ZR1 quits once in a while when driving.
Needle drops as if ignition key is turned off to less than zero.
If I turn the ignition key on (engine off) the tachometer needle does not go up to zero like normal indicating a bad connection.

Seems like a bad connector on instrument cluster since the tachometer function often returns to normal zero when ignition key is turned on and tachometer will then function normally for a while.

phrogs · 4 Weeks Ago

I had a crazy tach needle it was reading about half what It should have. decided to get the Batee chip and fixed it.

But you could for sure have some weak solder joints

4 Weeks Ago	#1
Dynomite Join Date: Aug 2009 Location: South Dakota/California Posts: 3,788	Tachometer Issue Tachometer on 1990 ZR1 quits once in a while when driving. Needle drops as if ignition key is turned off to less than zero. If I turn the ignition key on (engine off) the tachometer needle does not go up to zero like normal indicating a bad connection. Seems like a bad connector on instrument cluster since the tachometer function often returns to normal zero when ignition key is turned on and tachometer will then function normally for a while. __________________ Left Clickable links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 4 Weeks Ago at 12:43 AM.

4 Weeks Ago	#2
phrogs Join Date: Jul 2004 Location: Kalamazoo MI Posts: 1,738	Re: Tachometer Issue I had a crazy tach needle it was reading about half what It should have. decided to get the Batee chip and fixed it. But you could for sure have some weak solder joints __________________ JOHNNY P Currently own 90 ZR-1 #845 DRM 500 engine package 90 #226 Might be a parts car not sure yet