Not a nuisance at all mate. you literally do just need a connection between gauge and sender. Literally a straight piece of wire about a metre long. Your chap does seem to be making a meal of these problems, to be honest I suspect he's either out of his depth or stringing you along for labour!
The gauges are so simple, 3 wires on the oil gauges (2 on voltmeter but it works in much the same way) positive and negative (to power the gauge if you like) and then a sender wire which just runs straight to the sender (in a factory fit it won't of course and will go in to the loom, but ultimately will have nothing else inline so while it appears to go in to the loom it's still just a straight bit of wire.
The sender switches down to earth, no power to it, the gauge just reads the resistance to earth and displays accordingly.
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