Truck keep shutting down low oil pressure stop engine at highway speed. replaced oil pressure sensor. Went buy a mack dealer to just ask some questions guy came out with labtop checked truck said everything seems fine if there where no oil pressure u would no it told me check wiring harness looked fine but I'm no wire expert or mechanic I just change parts. When I crank truck up no more problems oil pressure is right again engine sound fine normally runs 50 to 55 at 1500 rpms 29 at idle. but before it come on it sticks at 35 even if I down shit to 9th and gas it.