ok my dad and i are kinda puzzled here. my dad has a 92 yj and the temp gauge automatically reads 150 as soon as he cranks the jeep. once it has run for alittle bit the gauge just climbs all the way to 260. he has replaced the temp sensor, thermosat, and the water pump. he has also grounded the temp sensor also. and when we did the responded by going all the way over like it suppose to. i took my(95 yj) gauge cluster out and put in his and it did the same thing.