Do tach and speedo feed off of each other??
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Joined: Jul 2000
Posts: 151
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From: Munford, Alabama
Car: 91 Camaro RS
Engine: 350 C.I.
Transmission: 700R-4
Do tach and speedo feed off of each other??
I was wondering if the Tach and speedo feed off of each other in any way via the speed sensor or anything with the computer, reason why I was wondering is I just got my car back with the 3.23 gear swap and I know the speedometer is wrong but it still reads the same RPM as is did with the 2.73 at 70 mph and I know I should be turning more and then sometimes the tach reads way above what it should be I am confused. I have ordered the gears to fix the speedo by the way.
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Joined: Jun 2002
Posts: 344
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From: Vermont
Car: 1986 W69 Special Edition
Engine: 2.8/ECM/Int/Exh
Transmission: T5
Axle/Gears: 3.42 posi
They shouldn't... The tach gets pulses from the ignition system, and the speedo gets pulses from a transmission mounted VSS pickup, or a mechanical linkage.
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