Gauges acting wierd

Well this saturday morning I was going the mall and then like just suddenly the temp and fuel gauges went all the way up and like all the way Up. also the idle is like always different whne I stop and then go like I stop at 700 and then like push on the gas a little the idle goes and stays at 1500 and I know that's not true because the engine doesnt make the noise of an idle at 1500 just stays at a 700 idle. I have no idea what the problem is, but if anybody knows exactly or what to check please help and also I did search so don't say search. Im here to answer your questions and your here to answer mines.

bad wiring for the gauges maybe? if its some ebay a/f gauge then dont expect it to work. as for your idle, check the tb and cable, maybe its just stuck or too tight, something simple probably