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YOUR FUEL INJECTORS HAS TO BE PRESSURE CLEAN IF YOU HAVE PETROL ENGINE.BEST TO LET GARAGE CLEAN INJECTORS.YOUR POWER LOST PROBLEM COULD BE FAULTY TURBOCHARGER OR WASTEGATE ALSO CHECK FOR RESTRICTED EXHAUST MUFFLER OR CATALYTIC CONVERTER.
These gauges have switches that work by earthing, ie, if you take wire off at sensor end & touch any metal surface on your engine with the wire end the gauge will rise to maximum, it may be the wires are earthing out someplace. There is a voltage stabilizer on back of your dash that maty be going faulty?
Hope this helps.
I had same problem with petrol gauge bouncing around all over the place, full tank, half a tank and nearly empty in the space of 10 miles.
I knew that if I filled the tank I would get approx 200 miles for half a tank so I did that for a while and just kept topping up. Audi testing it and the fuel sensors in the tank had to be replaced. I'm afraid its the only permanent solution!