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Adding an overheat alarm for Johnson/Evinrude

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SaltyScot

Regular Contributor
I have 76 Johnson 35 with no tell tale. I'd like to add an overheat alarm or gauge to prevent cooking another motor. I know some of them came with them, but it is possible to add one where there wasn't one originally?
 
SaltyScot said:
I have 76 Johnson 35 with no tell tale. I'd like to add an overheat alarm or gauge to prevent cooking another motor. I know some of them came with them, but it is possible to add one where there wasn't one originally?
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What was used in the past and is still available via your local marine dealership is a heat gauge kit consisting of a gauge, wiring, a heat sensor, and a "L" shaped bracket that attaches to one of the head bolts via a hole in one end of the "L" bracket. The sensor screws into the "L" shaped bracket via a threaded hole in the other end of the "L" bracket. I always allowed a .010 clearance between the bottom of the sensor and the cylinder head to avoid false readings.
TEMP-GAUGE-PARTS.JPG
 
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