hi i have just put a 260hp om605 merc engine in a disco 2 taking out the td5.the ecu is still in and have most thinks are working,but the temp is not i have the td5 sensor on the wiring and when the ignition is turned on the temp gauge goes up then down and the red overheat light comes on .also think this might be why the glow plugs have no power to them as the ecu thinks its hot ,maybe .any help on this will be good