Wiring diagram the gauge on the dash are not accurate

All of the dash gauges and warning lights get power from the same pink/black wire. You should have a pink or purple wire coming from the sending unit in the tank that provides ground to the gauge.

The repair manual for your year,make and model, will have the wiring diagram you'll need to re-wire the fuel gauge.

there is two things : fuel gauge and dash fuel gauge. The fuel gauge in tank rated to 0 to 90ohms.disconnect wire at the tank take a variable resistor connect it to wire .read the dash gauge if it move as you move the resistor. if ok fuel tank gauge is at fault

You mean by gadgets, warning lights and gauges? That would be from the ignition switch's run wire, the wire from the on position. This wire sends voltage to the ignition system, and to the dash for the warning lights and gauges-but not directly to the dash-the signal would reach the dash after being routed through the fuse panel to a fuse for the dash gauges and warning lamps. You need to check if that fuse is good.
Recall seeing any wiring diagram? The fuses are labeled either "hot at all times" or "hot in run or start". The fuses labeled hot in run or start are only sent power when the key is on, so power for those fuses are routed through, or turned on by the key being on. Depending on the car and its wiring set up, many will have relays that are turned on by the run wire, and power is then sent from the relay to that circuit's fuse in the fuse panel. This relay may be called the ignition relay. Or your car may have a different relay to send power from the run wire to the fuse panel.
The only way to figure yours out is to see a wiring diagram for it. Then you will see how power is sent from the ignition switch to the dash.
Wiring diagrams are almost always found in repair manuals. Check if your library has a manual for your car. Most libraries have quite a few repair manuals. Or parts stores sell repair manuals too, for about $25. Try to find a Haynes repair manual for your car. The other popular repair manual is from Chilton. My preference is Haynes, just my preference. I been burned by Chilton manuals sooo many times-incomplete wiring diagrams, incorrect information, incomplete information. Haynes are not perfect by any means, you want perfection-spend big bucks for a factory service manual ! In general, Haynes is more complete than Chilton.
OK, enough venting. If you have a test light, check for power at the fuse for the dash (may be labeled "gauges" or "instr pnl", something like that) with the key on. If it has power with key on, wire from the fuse goes to the dash. If that fuse has no power to it with key on, power has been lost between the ignition switch and that fuse-now you definitely need a wiring diagram to find the problem.

fuel level sender in fuel tank

I don't have the specs on your dash gauge. You would want to run an OHMmeter to test resistence at the dash gauge, then check the Ohms at the wiring from the fuel sending unit. The change in the Ohms from the fuel tank is what moves the dash gauge.

Best I can help with is a chassis diagram at Autozone.com, FREE, when you register your car.

You can go to a Salvage yard with an Ohmmeter and test a fuel gauge on-the-car to see if it has different resistance. This would indicate whether your gauge is good or not.

Hi , there will be 3/4 wires at the fuel tank gauge. 1 ground wire ,1 gauge(on dash) wire, 1 gauge low level indicator light (warning on dash) Get a test lamp , ground test lamp and probe each wire. 1 will do nothing (earth wire) 1 will bring on dash low fuel light , the other will be the gauge on the dash which will rise (slowly) to the full position.

Your dash gages have one plug on them and one big flexible plastic circuit board that runs all the gages no wires

Possibly a bad ground wire at the sender on the tank,

Check for that first before tearing into the dash to replace the guage.

need a wire diagram too for the switch I have discovered that two wires powers the pump to pressurize te lines and other 2 powers the fuel gauge on the dash but 2 wires i don know what they do my gauge doesn't indicate fuel in any combination of the six wires