If A 100$ is all they charge you that is. Easy. Take off the drivers air box assembly: there are 2 10mm fasteners that holt it on. This is after of course you removed the black cowling panels that cover the hyd fluid tank. Remove the hose clamp via the throttle assembly and leave the MAF sensor side on. Unplug the MAF sensor and the one sensor in front, or IAT temp sensor. Now remove the black metal top radiator support; there are 6-10mm bolts, real easy. This will allow you to lift the entire air-box with the rubber intake boot hose and front inlet plastic horn attached as one unit. When you get this out, you can see the oil pressure sending unit under that assembly; it should have a green wire. Also like Brett said above, read the posts. Your wiring is probably shot. If the wire loom crumbles in your hands, chances are you will see naked wire that had its plastic disentegrate via the heat. You could probably access this unit from under the car too if you had real small hands I guess. Good luck and save your $