I would recommend replacing your thermostat just because. It is like $12 or something like that and a 5 min job and it is just good for piece of mind for that price. My temp sender always stayed right in the middle and then I changed the sender and water temp gauge and noticed that it moved all over the place. I think the stock one is not very sensitive. I replaced my thermo too but turned out I did not need to. Still glad I did.
2009 King of the Hammers
BUCK Wild Racing
Co-driver: Pat Quirk
Rover Tracks www.rovertracks.com
DJ Safety www.djsafety.com
West Coast Rovers www.westcoastrovers.com
Reel Driveline www.reeldriveline.com
Made it further than half of the other guys, but the Hammers won.