something else to consider...rarely do temp sensors go bad. i was at crown honda a few months ago trying to figure out some temperature problems and i talked with one of their technicians. he said the temp sensors are one of the easiest things to fix but they're not often the problem. in my case, my thermostat was not opening fully and at the proper time.

as far as your car it may also be the guage cluster. if you have a friend with an integra guage cluster plug his in and see if thats the problem. unfortunately you'll probably end up spending some money on this before its fixed unless you get lucky. thats why i'd do the cheapest and easiest things first.