Controller is just another name for the computer. On a G series, everything other then the dome light is controlled by it. Depending on your machine, it is under the cab on the left side or on the left side by your feet behind the side panel. if you look over the LF wheel you can see the bolts. The 7 pin, if you have the harness on, id the electric connection above the aux couplers. Your machine might have a 14 pin also or both. Anyway, those will run back to the battery, there will be a bigger round plug that is plugs into. If you don't have the harness installed, there shoud be a cover on the plug. I will try unplugging the oil sender on a machine at work tomorrow and see what it does if it when it reads no oil pressure. Check the magnet switch on the seat bar, if it dirty it sometime don't work right, try blowing it off. That still would have nothing to with the oil light. The machine should move in traction override, seatbar dosn't have to be down for override. I move machine sall the time standing on the bobtach/