Tach is really off.....
Thread Starter
Former Sponsor
iTrader: (1)
Joined: Feb 2002
Posts: 1,081
Likes: 3
From: Florida
Car: 1992 Camaro RS
Engine: Yet another 350 TPI
Transmission: Borg Warner 6 spd
Axle/Gears: 3.73
Tach is really off.....
Comparing the tach in the car to the rpms that the ecm is reporting via ALDL, one or the other is VERY off. Idling at 750-800 rpm, my tach shows about 1100 or 1200 rpm. At 2000 rpm, the tach reads 2600. I am assuming the ecm figure is correct, and the tach is wrong. Is there any way to adjust or modify the tachometer so that it reads correctly?
Senior Member
Joined: Oct 2004
Posts: 575
Likes: 1
From: Smithfield, NC
Car: 1987 Camaro SC
Engine: 2.8L MPFI (rebuilt)
Transmission: 700R4 swapped to T5
Axle/Gears: 3.42 open
Check this thread, same problem fixed.
https://www.thirdgen.org/techbb2/sho...hreadid=272845
Tachs fail all the time on our cars, and always fail by reading higher.
https://www.thirdgen.org/techbb2/sho...ight=tach+high
https://www.thirdgen.org/techbb2/sho...hreadid=272845
Tachs fail all the time on our cars, and always fail by reading higher.
https://www.thirdgen.org/techbb2/sho...ight=tach+high
Last edited by bru333; Jan 6, 2005 at 06:20 PM.
Thread Starter
Former Sponsor
iTrader: (1)
Joined: Feb 2002
Posts: 1,081
Likes: 3
From: Florida
Car: 1992 Camaro RS
Engine: Yet another 350 TPI
Transmission: Borg Warner 6 spd
Axle/Gears: 3.73
Is there a way to adjust it or compensate for the difference. In other words, fixing it so it reads correctly. Once I get the car dialed in, I don't want to be guessing as to when I need to shift. I also don't want to install an aftermarket tach in the car. I think it looks out of place.
TGO Supporter
Joined: Oct 2002
Posts: 9,067
Likes: 1
From: Saskatoon, SK, Canada
Car: '83 Z28, '07 Charger SRT8
Engine: 454ci, 6.1 Hemi
Transmission: TH350, A5
Axle/Gears: 2.73 posi, 3.06 posi
If you have a manual trans, just shift when it stops pulling... thats when you wanna shift anyway.
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