Spend the 12 dollars and get a universal mechanical oil pressure gauge, remove the oil sending unit on truck and screw new gauge into and start truck. Does it read pressure? I know people will say just replace oil sending unit but i like to visually check for a true oil pressure than to trust a light, at least you will know what pressure your motor has. if you have pressure then replace the sending unit. Most of the time when the sending unit goes bad your oil pressure gauge in the truck will run at 80 psi all the time. Since you have a light the sending unit just says it isn't getting pressure which turns a light on. So be safe and do as i suggest, if there is no pressure at the mechanical gauge then i hate to say it but you may have a bad oil pump. I honestly just think you have a bad sending unit,if you want just replace it and if lights go off thats good, but you still don't know what the pressure is and if you feel comfortable with this then do so.
On the other hand, the oil level sensor has two wires; Black/White = ground (G103); Brown = oil level signal going to the PCM. See sample diagram below:
The PCM monitors the input signals coming from these two sensors, and it will communicate to the cluster (IPC) through Class2 serial data line. The IPC will then indicate the corresponding values on the pressure gauge and will also indicate a warning lamp or message when necessary.
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