Rebuilt a 2.6 and truck is running excellent. Having a oil pressure issue with the sending unit I think. At first I put a oil sending unit on for a dash light that did not work with my oil pressure gauge. Sent away for what is supposed to be the proper oil sending unit for a gauge, after installing and starting the engine the gauge needle moves normally but passes mid range on the gauge where it used to be around, continuing all the way right to the end of the gauge and stays there. Any advice. Will check oil pressure with a manual gauge when I get proper fittings.