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EGT gauge persistent problem

Yachtcare

Recruit
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Gauge never really worked when installed six months ago, fooling around with it was backburnered. Needle was always pinned at the high end upon applying power. Dealt with customer service(Faze gauge, by Sunpro), etc, etc, etc. No go...

Replaced the batteries yesterday, and the gauge has come to life?(WTH's up with that?, but I wont complain)

The one problem now seems to be a jumpy needle. My lift pump is jumped directly to the ALDL, so it comes on with the glows. I can see the needle jumping in time with the lift pump pulsing.....

The gauge gets power from an ignition source on the fuse block, and is grounded directly to the ground lead on the rear battery(both batteries are on driver side)

Any suggestions to clean up the interference? A diode, or resistor some place?..........Thanks.
 
As you know it is most likely an electrical issue. Have you tried connecting to a different power source on the fuse box.
 
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