I would check the gauge and the line, setting not running for 1 hour could not have changed anything in the engine ,get a after market oil pressure gauge at FLAPS it will come with a plastic line and fittings for around 15.00 remove the old line and screw the new one in just start the truck and then look at the gauge you could even close the hood and run the line thru the window and take a ride .
Jerry , there is no oil pressure on a splash oil engine at the connecting rods,mains yes ,connecting rods no.
Pete
