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So I drive my 92 Silverado 100 miles last night and my speedo is reading around 50 mph at about 75 mph??!!! It has worked fine until last night. What gives? jess
What about other speeds, is it at 0 while moving 15, 20 at 35? or just starts to differ at 50?
A progressively increasing problem is usually tire size cable or similar issue. A certain speed and up issue is usually gauge.
A jumping around gauge is either a cable or gauge, but depends mostly on what kind of gauge.
you dont have a cable right? Vss?
does it work in reverse
You're right, VSS, no cable. Seems slow but steady until 50-55, then won't go higher. Haven't checked for codes. I switched rear axle ratios about 10 years ago and had to have the board behind the glovebox recalibrated, it's probably the culprit.