1994 toyota pick up fuel guage not working properly

Are you sure that you have the proper amount of fuel pressure? Low pressure will prevent a proper atomization of fuel at the injectors and ultimately poor performance. You should have over 45 pounds of pressure at the fuel rail at idle. If the fuel filter isn't clogged, it could very well be a weak fuel pump. You can verrify pressure with a mechanical fuel pressure guage at the rail.

It is the sending unit, usually the veryable resister and arm. Remove and replace sending unit. It is , unfortunately, located inside of the fuel tank. To confirm gage operation reverse wiring to the guage and it will reverse the guage, confirming tha the gauge.is ok.

sounds like you have a vacuum leak somewhere, or a vacuum line not hooked up properly

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Yes you defnitely need to take out the instrument cluster to replace the bulb.

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Check the thermostat.It sounds as though it's stuck in the open position. Fuel comsumpion increases as well.

check and replace the fuel pressure regulator on the fuel rail

The information you are requesting is copy writted in order to get it leaglly go to alldatadiy.com and buy a subscription to your car and you can view all the informantion you want. and the diagram shows all the information you need includeing a powertrain harness and look up by system not in a book.

Check the fuse/connectors at the battery post.

You need to replace your fuel sending unit. It is located inside of the gas tank.
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I would be checking yor fuel pick-up line in your tank to see if it is damaged and the other thing I would double check is that your fuel guage is working properly. Back in the early eighties there was a car that the fuel tanks were double walled and the inner walls were collapsing, I don't hink that this is your problem but it would be something that if it was my vehicle I would check. Also check your breather vent on your fuel tank