Usually you will not get an accurate oil pressure reading either too high or too low. Occasionally they will leak and pump oil through the switch
You need to specify WHICH switch you're talking about... Low pressure switch? Fan control switch? What?
the car won't start
No, if the oil pressure switch is bad it will just give you a false reading of your oil pressure.
Low freon, bad compressor, bad clutch, bad pressure switch (could be multiple of these), bad switch...the list goes on. Best bet is to take it to a mechanic for a diagnosis.
what happens if the transaxle range sensor goes bad?
A bad neutral safety switch generally causes one of two problems. Either the car can start in any gear, creating a safety hazard, or it will not start at all.
Switch could be bad or the schraeder valvee the switch screws into could be bad
Either replace with a known good switch or with a manual oil pressure gauge
Of which low pressure switch are you speaking? Engine oil pressure switch? If you're checking that, remove the oil pressure sending unit and temporarily put in an oil pressure gauge. If you're checking the AC low pressure switch, pull the switch from the AC low pressure line, Jumper the switch socket and see if the AC compressor comes on. If it does, you either have low refrigerant pressure or a bad switch. If you KNOW the pressure is up and everything else works, you have a bad switch.
What?
The most common problem on these trucks will be a bad pressure switch along with a bad pressure switch pigtail.........