tach reading 2k above normal for no reason

[Thorbolter]

My engine will just be idling and it will jump up above 3k for no apparent reason. Engine sounds fine so i think their may be a loose connection or something but i just dont know. Any ideas?? Thanks.

 

[TPLYNCH]

Does the engine itself rev? or is it just the Tach jumping? You weren't very clear....

 

[Thorbolter]

Sorry, the engine is not revving at all, just the tach will jump up 2k randomly.

 

[TPLYNCH]

Probably the device that sends info to the gauge gone whacko. Not sure what or how it works however. I think there was a post recently about Tach not working that may have discussed the mechanics of how it works. Try searching for it....

 

[Runnin'OnEmpty]

I think Tom is referring to the Ignition Module that is located underneath the battery. That's where the tach gets its signal. You might try spraying some WD-40 into the connector to the module......