RPM gauge or Tach not working right

[Fisherman_7]

I have a RPM gauge that will read fine, then all of a sudden nothing. If you go a little more, then it will start reading again. I thought it was a faulty gauge so I changed the gauge out to a new one. Still does the samething. Off sometimes, then reads sometimes. Im thinking its a connection somewhere either on the gauge or on the wires coming off the stator that's not making good contact. I have 1984 V4, 115Hp Evinrude. Any suggestions how to fix problem?

 

[Will Bark]

Re: RPM gauge or Tach not working right

Clean all connections on back of the tach shiney bright as well as the ground connection from the tach to ground. Good luck

 

[boobie]

Re: RPM gauge or Tach not working right

Got a model # ??

 

[multimech]

Re: RPM gauge or Tach not working right

Check the connections on the engine for the regulator rectifier. Do you have a voltmeter? Any changes in the readings? Ensure that the pole settings on the tach are correct.

 

[emdsapmgr]

Re: RPM gauge or Tach not working right

Possible that the rectifier on the engine is going bad. The rectifier does two things: provide a charge to the battery and transmit a tach signal to the gauge. When they go bad, you can a number of different tach failure modes. Have you noticed that the voltmeter is reading lower lately?