Originally Posted by FiveSeven SS190

Well, with what you have said, I probably don't need to confirm my sender probe as "defective". Very Good Info to share Canadian. My Questionable gauge/sender says the water temps this weekend was 240+ F in traffic and the factory gauge was still a hair below dead center.

Sounds like it should be rising above dead center according to your notes.

Keep us posted what your temps go down to when you do a new radiator. Also, let me know what radiator you decide to go with and if it was an "EASY DROP IN" affair. That's my next upgrade on the cooling list of items is a bigger radiator.

I wander if the NISMO thermostat (opens at 154 F) is even a good idea (if you don't wire fans to kick on earlier) with a bigger radiator and oil cooler in place. Also, I always wandered if the lower thermostat just "stays" open and water doesn't really get to spend any real time in the radiator to get a good "heat cycle".