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No luck finding someone to show me how to put vid on youtube yet. The google instructions don’t make sense. But… today an old outboard guy came over and while he is a true blue mercury guy, (been rebuilding and racing them since the fifties) he told me that as far as he is concerned the engine is cooling well. We did have a linkage issue, solved by adjusting the mechanism that shifts F-N-R and the ‘indents’. Day by day I am feeling better about this. Confidence is also growing. So, with you guys help the Mercury switches and solenoid issues have be laid to rest and I will set up a thermocouple or RTD in contact with the thermostat housing and see what that shows. I am a retired process engineer and seem to have a bit of this measurement stuff still laying around! Thanks all!! Tom Alexander