Wacky Tachometer
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Joined: Dec 2004
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Wacky Tachometer
Hey dose any one know how to get the factory tach working on my '85 6.9L. I started jumping from 500 to 2000 and then just went **** up on me. I can't figure out where the pickup sensor is or the wireing set up for this thing Thanks for any help
Senior User
Joined: Feb 2004
Posts: 152
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From: Utah
Mine did the same thing after I bought it. I was able to get it fixed by just cleaning the sensor.
If I remember correctly the output is an AC voltage between 0 and 40 volts. So set the volt meter to AC and measure the volts while the engine is running more volts=more RPM.
If I remember correctly the output is an AC voltage between 0 and 40 volts. So set the volt meter to AC and measure the volts while the engine is running more volts=more RPM.
