Temperature gauge rises during acceleration

SOURCE: temperature gauge reads high

i think there is 2 sensors or your thermostat might be stuck. you can remove the stat and see what happens if it runs cool then replace it

SOURCE: Intermitant temperature

Check to make sure your thermostat works right by monitoring the warming up of your engine. With a completely cold engine, start and run the engine for a few minutes, then put your hand on the top radiator hose to monitor if and when it gets warm as the thermostat opens more and more and note the gauge reading( if it works) the top radiator hose should be unbearably hot within 5-8 minutes. If the therm. opens right it should close right aswell, staying open a little while eventhough the radiator may have cooled may be what you are experiencing causing the rapid cooling and is nothing to worry about. The Hose should not get warm very soon after starting the engine. Regarding you gauge, lets take one step at a time, verify proper op. or the therm.

SOURCE: i have a 1992 toyota celica with a high idle speed

i would remove dash clocks and check connections