Explain mechanical vs electrical gauges? ..plus

Originally Posted by Read T

Electrical: My 370z, there are sending units on the engine and wires go to the gauges in my car.

Mechanical: My morgan, there are large spinning cables that run from the engine to the tachometer and the transmission to the speedometer. There is also an oil line that runs from the engine to the oil pressure gauge. When that line came off, my lap was filled with hot oil.