Has anyone on the list changed their Oil Pressure Sswitch. I am in the process of upgrading my Engine Panel and thought it would be a good time to upgrade the send units. I am also changing the water temp and adding a High Water Temperature Alarm. I am having trouble locating the oil send unit, it might be behind the Manifold. Any advise would be appreciated. The engine is an 89 Universal M25XP. I have been on the Torrensen site, but have not been able to come up with a clear schematic. I actually have been purchasing all of my parts from them for a few years now. Very easy to order on line and fast delivery.