Hi guys, does anyone know what the two plugs on the fuel metering head should have going to them I.e on the black regulator box which h pin is earth- ecu- and 5 volts or switch, Also the same question for the other connector to the metering. My mechanic wants to check this and rule out regulators or ecu. Basically need to meter out both Connectors to establish they are working

many thanks hope this makes sense