What's wrong with my temperature gauge?

SOURCE: 2000 Honda Accord - engine overheats when stopped

There are only a couple things you can check. First, I would make sure the gauge is reading properly by checking the fluid temperature manually. Newer model cars have temperature sensors that can malfunction but they will usually set your check engine light off it that is the case. Check your radiator fluid. While the engine is cold!! See if it looks dirty. Rub it between your fingers and see how viscous it feels. Make sure the radiator is full. You may just need to get your radiator flushed. A lack of flow will cause an overheating condition. When your back in motion the engine has more pressure to circulate the fluid. When the car is moving there is airflow that also aids in the cooling process as well. Other than that you have a thermostat which could be sticking and causing it to overheat. Or the water pump is bad. A flush and fill and replacing the thermostat are fairly cheap and usually a lot easier to do than replacing the water pump. Especially on a Honda. Usually you will hear a squealing noise if your water pump is going out and there is, I think it is called a weep hole on the pump itself that will start to leak when the pump is going bad.

SOURCE: check engine light

My check engine light was on for a long time,after new sparkplugs and several trips to tuffy auto and almost $500 spent I gave up and brought it to a honda dealer-I HAD BAD FUEL INJECTORS - $700 spent everything ok now.no more annoying check engine lights!!!!

SOURCE: 1988 honda accord runs for 10-20 min, then loses engine power

Have you checked your alternator?

SOURCE: 2003 Honda Civic runs hot when idling.

Check the cooling fan switch. It appears your auxiliary electric cooling fan isn't going on when at idle. and engine temp increases. While you are driving, air is being rammed thru your radiator as you cruise along, so it isn't overheating, at idle, that isn't happening, and the fan should go on as the temp goes up. When the ac is switched on, the fan is being signaled to operate due to the heavy ac load on the cooling system.

SOURCE: Automatic Transmission shifting problems.

i had the same thing...It's the transmission. It's REALLY noticeable shifting from 1st to 2nd gear. I was able to get my transmission fixed for 900 bux. That wasn't even a replacement so i can imagine how much it would cost to get it replaced. The shifting will get worse. By the end of my "experience" it wouldn't shift from 1st to 2nd for about 5 minutes until i drove it around for a bit. THen it would "warm up" to the idea of shifting to 2nd gear.