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Temperature gauge moving all around rapidly

rudder1

Member
Temperature gauge moving all around rapidly. I got a 2005 with twin 305 merc cruisers with bravo three‘s and after starting the engine this season the temperature gauge on the starboard side is jumping around rapidly and just wondering if anybody could shed some light on this. Cleaned ground on the temperature gage and the sending unit.
 
I'd say get an IR temp gun and check to see if the gauge represents reality or is an anomoly.....if there isn't adequate water flow, the gauge will move around but not what I'd call rapidly....'rapid' fluctuations would most likely be a bad sending unit or the wire connecting it to the gauge...
 
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