Question about 1992 BMW R 100 RS

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Tachometer erratic

Tachometer erratic, varies 2K

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I bet thats down to a dirty wiring joint,,bme's are knowen for this!

Posted on Jul 06, 2010

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Posted on Jan 02, 2017

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I just solved this problem on my 1997 with 183K miles . First I checked all of the following:1) sensor on distributor; 2) wires from distributor to back of instrument cluster; 3) connections of wires to instrument cluster; 4) 4 screens going through the soft circuit board to tachometer; 5) the SOLUTION- I removed the tachometer from the instrument cluster and looked at the hard circuit board of the tachometer. On one side there is a plastic square housing about 1/4 x 3/8" soldered to the circuit board that has a plastic screw facing out. it was lose, so I tighten it and now my tachometer is OK. A simple test to check for this type of an error is hit your dash when the tachometer is erratic. if you see a fluctuation based on the tap on the dash you either have a lose connection of some type like this one. Fix is easy, once you have the instrument cluster out you only have to remove the four screws on the back of the cluster holding the tachometer in place. Remove the tachometer carefully and tighten the plastic screw being careful not to over tighten.

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The Tachometer is used to report how many Rotations Per Minute (RPM) the engine is running at. The number will vary depending on your speed.

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