Tach reading wrong or is it something else??
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Member
Joined: Jul 2000
Posts: 151
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From: Munford, Alabama
Car: 91 Camaro RS
Engine: 350 C.I.
Transmission: 700R-4
Tach reading wrong or is it something else??
Ok I put in a 3.23 gear and put in the right speedo gears and my tach is way off, the speedo is right. When I am going 70 the tach says I am turning 3000 rpm and I have messed with the equations and it says I should only be turning 2130 rpm. At 3000 rpm I should be going 98 mph. Is there something wrong here or what???
Senior Member
Joined: Jun 2000
Posts: 998
Likes: 0
From: Tuscaloosa, AL
Car: 91Z, 91RS, '84 Jimmy
Engine: L98, 355, L98
Transmission: 700R, T56, 700R4
After 200k miles your tach may be getting a bit out of whack. Mine started reading high at about 140k, and by 150k it quit working altogether. So I got an Autometer tach. 
Can you get ahold of a hand-held tach? Or just any aftermarket tach that isn't currently IN a car? It's very easy to hook one up and check your stock tach to see if it's accurate or not.
Incidentally, I did some work out your way a while back, in Oxford. Small world eh?
Can you get ahold of a hand-held tach? Or just any aftermarket tach that isn't currently IN a car? It's very easy to hook one up and check your stock tach to see if it's accurate or not.Incidentally, I did some work out your way a while back, in Oxford. Small world eh?
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
First, just check the connection to the distributor. Its the little brown connector thats hanging down the side of the cap.
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