I'll investigate that tomorrow eve. THNX for the thumbscrews. The first one
I turned, and turned, and turned, did nothing, didnt think it was threaded. It was. But it made me doubt myself and post here for help. Have acess now.

The US 606 ( or at least the one in my garage) has a 4 pin coolant sensor in the head near the rear, and a two pin up near the thermostat housing. Old 2 pin had rubbed clean to bare wire on the fuel hard line. And the temp still showed on the dash!? Go figure!

Cheers!