Slant Temperature

Correct. What are the other gauges doing? IIRC, the voltage limiting for the 66 and earlier models is handled by the fuel gauge. Use a brass tee if necessary, and install the sensor for the aftermarket gauge alongside the factory temp sensor. What about your fan and shroud set up? For all intents and purposes, 195 isn’t terribly hot, I think you more have a factory gauge problem than anything else. Did it always run at 190 degrees beforehand?