Yes my oil pressure drops when I come to a stop and goes up when driving
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Because of where you're posting, I'm assuming this is an OBS truck (you really should either state in your post the year & model or put it in your sig so people can accurately help). Rant over, sorry.
What you are describing is very common in those trucks. Usually when the sensor or a connection goes bad, it will stick at 80. It is normal for the gauge to rise under load. How low does it drop? Not being an ass, but have you checked the level? Maybe it's just low...
And now it won't work at all? Are you sure you got it plugged back in right, did it click back together? What is the gauge doing? Where does it read with key ON, engine OFF?
Finally, all the sensor is doing is sending to the gauge. So if you're sure there's oil in it, you're PROBABLY fine, but
@about20ninj45 is right, unless you can be SURE there's pressure, you're AYOR to a degree. It is POSSIBLE your oil pump is going...