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Dash Mounted Temp Gauge Testing

E

eriefeelin

Member
On my 1990 260 MerCruiser I ha

On my 1990 260 MerCruiser I have replaced the temp. sending unit on the thermostat housing and my IR gun reads from 135-145 degrees when measuring right on the brass base of the temp. sending unit. The gauge on the dash reads close to 170 degrees. Is there any way to test these dash gauges for accuracy?
 
"What makes you sure the IR is

"What makes you sure the IR is accurate?
If you hold your hand on the thermostat housing, 135-145 should be able to hold your hand on it indefinitely without pain where 170 will be quite uncomfortable"
 
I can hold my hand on there fo

I can hold my hand on there for awhile but would not hold it there for say more than 10 seconds. The IR gauge is brand new and the gauge on the dash is 19 yrs. old.
 
"Check calibration on IR gauge

"Check calibration on IR gauge. If there is no procedure in the book that came with it, try this:

Fill pyrex cup with water.
Place in microwave.
After it boils for a few seconds, the IR should read close to 212."
 
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