Either that or the wiring to the sensor is messed up somewhere.

Also, I would be swapping back to a stock pulley if you have no way to scan for KR right now or you are just asking to replace this motor. Since there are no flow mods as mentioned it could just be a matter of time before a piston goes bye-bye. If it's running ok for now minus the temp gauge issue then I would say it gave you a 2nd chance, don't let it go by.

Also, what is it "tuned" for?