bad temp gauge?

i tried searching a bit but couldn't find anything useful, anyway has anyone else had a problem with their temp gauge or sensor? randomly the gauge will spike and stay pinned all the way in the red even though the car is perfectly fine, sometimes stays for hours, somtimes minutes i was just going to replace the gauge to see if that fixed it, is their any online honda dealerships everyone orders from (sorta like jay marks toyota for us supra guys) thats cheaper than others or any more accurate gauges that anyone has used? nothing fancy, it just has to work really. if anyone could help me out here i'd really appreciate it
-Kyle
EDIT: duh forgot... 94 EX