well i have the one in the dash and the aftermaket one , the aftermarked on gets up to about 200 to 210 max. the one in the dash shows the needle on r some times the m. with the 373 gears going down the high way makes it get warm. hell i dont know that fricken blower throws out alot of heat also. it never gets over heated ,like in the morning when im going to the gym it stays at 180 on the aftermarket one. then on the way home when im leaving like at about 6.30 or so it gets up to about 195 to 200.