The cluster was a replacement and a direct drop in for the one I removed from my 91 740. However I am not sure of the donor vehicle. I merely removed the old one and installed the replacement. The connectors at the back of the unit were just plug and play. Hard to make a mistake there. As far as the connections at the sending unit I did not mess with the wires for the sending unit part. The wires are green and brown. I have replaced the fuel pump before ( only one intank for Regina system) and had to desolder and resolder the wires to the pump. The wires are black and pink.
It seems to me that the sending unit is passive in that it is not powered to make it function. It looks like it is just a variable resistor.
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