Prime Pump wont stop after 2 minutes

[Pd6cas2]

Hi
All , 2002 CM570 Serial 14025823
I just had Gearhead shop tune new Reman Ecm , on my way south in Texas check engine turns on No Oil pressure!!
Pulled over shut off engine, hooked up Insite high temp and high Voltage. Harness connection was the problem, $720 New harness.
Now I a new problem Prime pump stays on Continuously, I unplugged connection at pump and this morning I plugged in pump without turning Ignition switch and still pump has power going to it!
Any help ls better then None.