from ex Auto sparks...The Alternator has the Large heavy wire on it from Starter main battery supply, the Blue thin wire is alternator "Field excite/Warning light", The only 2 wires on Metering head are for the "Pressure actuator" the colurs hear in the plug are "Brown" & "Black/yellow" The Starter solenoid small excite terminal wire is "Black/yellow", this circuit is know as circuit 50, and is used more on the "Bosch "K" & "KE" systems, other wires you mention I have in my notes from back too many changes over the years, so should come to light when car running and what wires left, Temp Dash gauge wire will be clear to see , as on thermostat housing near exhaust, UNLESS your talking about the Injection system Temp sensor, then it will be "Yellow plug" 2 wires "...Brown & Brown/green". hope of help. Peter.