Re: temp gauge pinned - help
start the jeep up with the hood open, once it reaches your fan setting temps see if the fans come on if not could be your relays. Check your over flow tank make sure its not empty typically it will set off a CEL if it gets too low. If those 2 thinks check out fine I'd swap in your OEM t-stat or buy a new one and test again, if that doesn't work then yes move on to your water pump.
Doing the cheap, easy stuff typically pays off before just throwing parts at it. The relays are inexpensive, easy to replace in 5 seconds, the t-stat maybe 30 minutes.
2012 Shelby GT500 w/SVTPP
2007 SRT8-12.23 Best ET to date:cool:
CMR tune and AFE Stage II Intake