my gas gauge isnt workin and my engine has trouble turning on so i think its the temperature sensor... where is that located under the hood and is it hard to replace?

 

i don't think that is your problem. Not sure what temp sensor is, do you mean engine temp coolant sensor. If so, that located under your distibutor and that would not cause it not to start.
Is the ecu throwing any codes

 

not the water temperature sensor.. sorry.. its the temperature sensor

 

Do you mean intake air temp sensor. Just thought about it. That makes more sense. It's located on the intake on the drivers side. Has philips head srews holding it in. They are kinda tough to change because the screws strip. Make sure you have a big enough screw driver so its tight in the head. should have no problems.

 

no.. its part of the fuel injection area