Hey I've bought a polo playa 1.4 the fuel gage and temprature wasn't working so I replaced the fuse then both gages goes up and down the whole time,can u help me please?

SOURCE: fuel gage does not work

I just fixed that problem in my 87 Toyota pick-up. My fuel gauge showed FULL all the time. The sending unit in your fuel tank has probably croaked. I had to drain the fuel tank, remove it, and try to remove the screws that hold the sending unit in. The screw heads ALL snapped off due to them being 21 years old. Ended up having to buy a new fuel tank, as we couldn't get the broken ones out of the tank. Found an aftermarket new tank for about $275 at Advance Auto. Sending unit is only avaliable from Toyota for about $125.

SOURCE: 2001 Pontiac Montana Temperature Gage and Fuel Gage malfunction

sending unit or float in gas tank, check if any broken wires or well plugged in and then check the float for the gas.

SOURCE: Fuel gage on 2005 altima is way beyond full. Does

It is either the sending unit in the gas tank or the dashboard gauge, either job poses its own challenges take your pick. If it is the gauge if you were lucky in a couple of weeks it will become unstuck in to pegged out position but that is only if it is a mechanical issue with the needle itself wedged in place.

SOURCE: Temp gage, fuel gage and dash lights out

yes it is the instrumentation voltage regulator (IFV) I have had to replace twice, it causes the fuel and temp gauge to fall to 0. It is in back of instrumentation cluster on left side about a 1"x1"x1/4", and cost about $50 from dealer.

SOURCE: fuel gage is not working along with odometer

when you pulled the top of the dash off did you check the cable connection to the insturment cluster. i had a similar problem where my gauges died individually including the spedo and tach. slapping the dash usually would cause the gauges to start working again, but that quit also and i had to tear the cluster out and check the conneciton. that fixed the problem.