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1985 Black Max 150 ( Where can I install a temp sensor )

T

TGBTG7701

Member
I have a great running old Mercury 150 Black Max I would like to install a water temp sensor in. I currently have an alarm, but want to be able to see the actual water temp of the motor. I am not sure where on the motor I can install a sensor.

Thank you for any help
 
Are there no plugs in the cylinder head into which a sensor can be screwed?

An alternative is to mount the sensor on the cylinder head so that water temperature is read but somewhat indirectly.
 
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