Pan vacuum, oil pressure, and transmission pressure. That is what the sensors are for. I may use the third sensor to monitor something else.
As for the oil pan, it did have a kick out and windage tray. However, it was designed for the 496 with a 4.25 stroke. The 604 has 4.5 stroke, so we took out the windage tray to clear the crank. It was just suppose to be temporary.