SL/R129: Irratic speedometer and tach
#1
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Irratic speedometer and tach
300sl. 1990 after running 25 minutes, if I slow down below 20mph or stop the tach and speedometer stop working correctly. The speedo will run about double and the tach barely moves off zero. I have new battery and have check all the fuses ( updated to brass). What do I check?