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#1
09-01-2005, 02:05 PM
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Speedometer is off by 10mph
I was wondering why my speedo is always off by 10mph.
If I'm really driving 40mph, it's reading 50mph. I loosened the speedo on the cluster to install a new dimmerswitch, unplugged speedo and put it back in tight. Still does the same. But I noticed a bit less twitching. Used to sway/twitch alot, like by 0.5cm to each side of the speedo needle. My records indicate that the transmission is not original but a rebuilt one. Could that be the problem? Is it possible to install a wrong speedometer? Running on OE spec tires, 195/70/14. Tire psi doesn't affect speedo readings, currently running 33psi though. 1983 300D Turbo. How can I get the right speed/calibration? Thanks!! 
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