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Q: Inaccurate Fuel gauge, tachometer, and no heat in a 2005 Bonneville. on 2005 Pontiac Bonneville

I just bought a 2005 Pontiac Bonneville and have had several problems with it since purchasing it. The latest problems I'm having are an inaccurate fuel gage and tachometer. The fuel gauge is saying I have anywhere from a quarter of a tank to 3 quarters of a tank of gas (when I know I don't have any) and the tachometer readings are sometimes sagging well below zero. I am also currently having to live without AC/Heat (In 25-35 degree weather. Any Ideas?
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my bonny is doing the same thing only it gas gauge and temp im also seeing the speedo erratic durring post start up sweep yesterday my heater qiut all fuses are under back seat but were good mine would sometimes start working after hitting a big bump so next time i used my right foot to kick the fan motor wich is just a couple inches inbourd of your foot when its on the gas pedal and it took right off ive had to do it twice now ive been told they are about 40 to 60 bucks on line also the gauges are ran by small motor mounted on the back of the insturment cluster and can be replaced
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