Ive got a 2001 Cherokee that im a little wary about. My mechanic skills arent great at all, but on a cold start up the gauge goes up to 60. once its warmed up it goes down nd idles find a little above 10psi, but i was driving opn the highway and only getting 40psi. It does have a bad rocker (ticking) which isnt bad, not sure if thatde contribute to it but not sure if it could be the sender either. Any advice? Ive read up about these models cracking too as of now its 1000 into the last oil change, 5w-30 with the napa gold filter.