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They are 2 ways to get this. An internet search using your year make and model car with the term fuel pump wiring or wiring diagram usually pulls up a collage of good diagrams. Or the autozone site has a help site at the bottom of its help page, There is a free part and a pay part, but free info will supply diagrams.
I don't have the diagrams. Not buying it either. But it is either pink or grey. Anything black is ground. Since 99% of the ones I do is grey, I choose this one. A 94 has 4 wires. Two are ground. one is the fuel pump, the other is the fuel sender/gas gauge. Ground it , then add 12 volts to the others. It won't hurt it. If you won't the wiring schematics, Go to alldatadiy.com ad you can buy them, plus everything else about your car.
You should invest the $25 in a repair manual from the auto parts store. It has wiring schematics in the back of the book. Get yourself a decent digital volt ohm meter and start tracing the wires for your oil gauge, or you could try changing out the oil sending unit on the motor. It may be bad and they're not that expensive. As for the gas gauge, it sounds like you have a sticking float in the tank. As far as I know they do not sell the float and the fuel pump separate from each other. I would just watch the miles per tank of gas on the trip meter, unless you absolutely have to have a gas gauge then it's time to change the whole pump assembly.
to check it . wire at the fuel tank gauge unplug it the black and purple wire for gauge. put a variable resistor , fuel gauge is rated 0 to 90 ohms. So variate the resistor and see if fuel gauge move. if it does fuel sender have problem or inside tank wire
Most of the time its is the sending unit in the fuel tank. The test for it is to use a variable resistor that is hooked up to the wiring at the fuel tank and watch the fuel gauge if the gauge works ok thats makes 100% sure its the sending unit. At 245 ohms the gauge should read full, 180 ohms for 3/4 full, 160 ohms for 1/2 tank, 100 ohms for 1/4 tank and 42 ohms for empty. The color of wires at the fuel tank is purple wire and black wire. You can also use fixed value resisters. If the fuel gauge the wires from the sending unit to computer then to gauge for bad connections, shorts, broken wire and bad grounds. If the wires test ok that only leaves insterrment cluster or computer which even most dealers can't test eather one but the insterment cluster would be a more common problem then the computer. But about 95% of the time it will be the fuel level sensor in the gas tank that causes the problem. Good luck.