my engine started running hot at idle in water or on hose
changed impelller an did flow tests by passing it.
water pump on engine was original with 860 plus hrs ALL fresh water. in fact the #2 eng gets her new one in fall layup
it was missing several fins and was not moving water very well
at...
Yup grease dielectric and msking sure a good connection is done
Swap senders may be next
Or just put new in..its 25 at oorierles
Pretty cheap test tool
really thinking to spend the dollars get new gauges and senders for both engines,
omc harness is notorious for wiggling loose and causing guage issue
my volt meters also randomly choose to dance , i have cleaned the large harness connectors
freshened grounds etc
but the oil pressure one still...
My pprt engine oil pressure at 3k rpm will out of blue do the needle dance.
Then settle
Then at another random time do the dance from 20 to 50.
Senders are original
Thinking out direct guage at sender to verify oil pressure
Then replace senders
Engine have 866 hrs fresh water
Only