1. Ok heres the problem. My car runs fine in the winter, but in the summertime, if you run the car over 60-65, it seems to get hotter...It doesn't overheat or smoke, but runs hot...and the oil temp. stays at about 25-30. Is this the thermostat?

2. My tempature gauge doesn't work but every other gauge does. Is this the sensor or the gauge itself? Im thinking of buying a 145 gauge cluster soon anyways, but I'd like to fix it because of the overheating problem above.

 

if your temp gauge is broken, then how do you know it runs hotter?
all cars run a little bit hotter in the summer, its no big deal.

if it runs lots hotter on the freeway, its proly the air deflector, this is the plastic thing that hangs down underneath the front of your car. If it is mangled, bent, cracked, or has holes in it, then replace it, had the same problem on my car.

the guage is just most likely the sending unit, replace it.
there really not all that accurate anyway, the best thing to buy is a aftermarket mechanical type gauge.