could tachometer be off??
Thread Starter
Junior Member
Joined: Jun 2003
Posts: 56
Likes: 1
From: Silver Spring, MD
Car: 1990 Camaro RS
Engine: 305 TBI
Transmission: 700R4
could tachometer be off??
I have a 1990 RS 5.0 TBI. My RPMs are significantly higher than a few years ago, seems if they have kept creeping up and up over the last 2 years. I was wondering if over time my tachometer could become off? Cruisin down the highway at 65mph and it states that the engine is turning over at 3700. I used to be able to have them under 2K at 65mph.
N E ideas?
N E ideas?
Senior Member
iTrader: (2)
Joined: Jan 2002
Posts: 925
Likes: 0
From: Kingsport, TN
Car: '92 RS, '84 Z28
Engine: 383, L69
Transmission: T56, 700R4
Axle/Gears: 3.42, 3.42
Factory tachs are not know for there accuracy. Also have you changed the rear gear in the car?
Kevin
Kevin
Member
Joined: Sep 2002
Posts: 234
Likes: 0
From: Jacksonville, Tx
Car: 91 RS, 00 TA Ram Air, 86 IROC
Engine: 305 tbi, LS1, 355
Transmission: 700R4, 4L60E, 700R4 NonLU
Yes the factory tachs can go bad. I had to replace the one in my 91 rs. It would idle at about 2500 rpms. I used it as a excuse to get a 140 mph instrument panel from a 91 z28. Went right in and my tach is now reading properly and I got the 140 mph speedo.
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