"Engine" Temperature Measurement.

[RPOL88]

I have a 66 Chevelle 138 car with a 71 402 in it. Under "normal" driving conditions the aftermarket heat gauge would read 215 t0 225 and go up from there. This was really bothering me. New 4 core radiator and shroud. New high volume water pump, stat, hoses, and whatever else. NO CHANGE. (over $600.00)A friend noticed that the heat gauge was hooked up to the head instead of the intake manifold and told me the gauge that reads head temperature is calibrated differently. Advised me to take my wife's thermometer used for cooking and stick it in the radiator. It does not waver above 182 degrees. Wish I talked to him $600.00 ago.