Oil Pressure and Water Temp Readings

firecapt13

Seaman
Joined
Mar 13, 2010
Messages
57
My oil pressure gauge reads 80 when I crank boat and at idle. As i start driving boat the pressure will drop a bit to about 60. I installed an oil sending unit from a auto parts store for the motor. I was wondering if there was a difference in auto and marine sending units for this.

Also when I started running my boat after rebuilding the motor the temps were around 120-140 with a 160 thermostat. I thought these were low. Now they are running more around 160-180. How much does water temps of lake effect temps of motor?

Boat is a 1992 Wellcraft with a 4.3 Mercruiser
 
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