Same thing. Crapped up connections on multiple readings are ground voltage differences,
TEST:
Run a decent gauge wire from engine block to the instrument ground at dash. Essentially your ensuring the block 0vdc is the instrument panel 0vdc. Remember these gauges are reading milli-volts. AKA 1/1000 of a VDC
Quote:
Originally Posted by oceanj
Twin 350 merc inboards. Doesn't pin just higher than it should be for both.
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