6.5 PMD issues
 

Am having troubles with my PMD. I have the Stanadyne 39405 grey 4prong model currently on the truck. Previous owner tried to do a relocation and bought a kit(Stanadyne 34583 black) mounted it and ran the wires only to realize it is a 6prong plug and will not fit. I can't seem to find a relocation kit for this 4prong plug coming off of the motor. Am I able to rewire this and make it work?
Truck will start and run no problem, sounds amazing. did notice the oil pressure gauge started running a little high even though I just did an oil change and have checked it numerous times. Will run anywhere from 10-15 minutes then will stall out. Can throw into neutral and turn key and will start, sometimes will keep running for another 10-15 others will stall again and have to wait about 1-2 hours until will start and run again.
I don't know what else to do and could uses some help. This is my work truck and need to get fixed ASAP