This oiling system is driving me nuts. Both senders work properly. Pump lifts oil as it should manually. Brown wire has 12v at the pump but the ECM will not send ground signal to the blue wire. Checked both senders twice. Have checked continuity on all wires and they all check out. Could it be the sensor that detects the flywheel rotation? New ECM, both senders are New as well. All grounds have been cleaned. Left the boat today baffled. I've read tons of posts on this subject but all of them point to items I've already replaced. Any help would be appreciated.