Temp gauge and sender for Merc 800 80hp

Moody Blue

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Joined
May 24, 2004
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Have a 1971 Merc 800 80hp that I'm trying to install a temp gauge for.

Having trouble finding a sending unit in a 1/8" pipe thread. Most seem to be 1/4", 3/8" and 1/2" pipe.

The other issue is that I have located a gauge that reads from 60-200 degrees which is ideal for these cool running motors. The sending units that I have seen, in the larger thread sizes, show a range from 100-240 or 120-260.

How can I be sure the sending unit is compatible with the gauge range?

Any thoughts?
 
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