oil pressue pegged over 60psi

[parrisc19844x4_468]

Ok guys, I just bought this 83 SWB and trying to fix a few lose ends. One is the oil pressure gauge / sensor pegging past 60psi. Just to be safe I put a new sensor on it, the bigger one that is suppose to be for gauges. Turned on the key, same thing oil gauge is pegged. So , I disconnected the brown wire from the gauge and turned the key back on, same thing, accept the truck would not start. So, I am thinking this is for the sensor that tells the fuel pump that there is oil pressure, so I plugged it back in and bingo, truck started.
What I know is that this 350 is from an 87 and may need two sensors. What is the best route for me to take. I know there is suppose to be a oil port above the oil filter, I looked but there is nothing installed there. Should I get another sensor, is so which one, Will I need to run a 2nd wire to the oil gauge? Seems like some rewiring may have to take place. I have a manual gauge, I could run the oil line from the port above the filter into the cab, I really don’t like the idea of oil up there.
Thoughts ?