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Old 11-22-2005, 11:51 PM
RUN-EM's Avatar
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Join Date: Jul 2005
Location: TEXAS
Posts: 313
Tach needle jumpin an thumpin----

So the needle would hit 3500 rpm in high gear and bounce a bunch and go to zero temporarily. With the air or heater on, the tach would not register over zero until I would hit 1800 to 2000, then suddenly spring to life. Could not for the life of me figure out ---WTF?

Then I replaced the mono valve heater control. All seems to be well again. No odd tach readings or needle bounces at all. Strange. Care to postulate a theory--- comments welcome



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Old 11-23-2005, 01:57 AM
Posts: n/a
Check tach amp (on drivers thing) and make sure its connected well.

Mine used to do this eventually died...and I replaced it with a junkyard unit.
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Old 11-23-2005, 07:21 AM
Join Date: Jul 2005
Location: Rocky Mount, NC
Posts: 119
Do a search for "cigarette butt".....this little trick worked to "fix" my tach.

1983 300SD "Helga"
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