Technical Jumpy rpm gauge

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Technical Jumpy rpm gauge

Fiatrick

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Nov 26, 2011
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Was driving down the road today and suddenly my rpm gauge started to jump up and down. Could it be a bad sensor ? Any suggestions on where to start ?
 
Bad sensor -> car wouldn't run as the crank sensor provides all the information.

Most likely bad contacts.
 
Found the wire laying(still connected) loose on top of the driveshaft. Could that have made some sort of inteferance?
 
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