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1973 Mercury thunderbolt 1150 Tower of Power Temperature

Just for fun and to have somet

Just for fun and to have something to read I need an electric temperature gauge. My engine came without sender or gauge in 1973. I already found one sender that fits in the block but here in Puerto Rico I cant find one gauge. Also I need to know whats the normal temperature rage.Mercury thunderbolt 1150 Tower of Power! Temperature serial #(3549794). Thanks in advance. Pedro}
 
"Pedro, A temp gauge is not go

"Pedro, A temp gauge is not going to be real useful to you since the motor has no thermostat. It will read dead cold at idle and hotter, the faster you go. The motors are engineered not to overheat if the water pump impeller is good and there is ample water supply and the boat is propped and loaded correctly. It is better to install a water pressure gauge. It will show little pressure at idle, and up to 10 PSI at WOT."
 
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