as far as i know its like a variable resistor (if thats what there called) like in a slot car controller, a piece of metal slides over a copper rod that looks like coil, depending on the % of throttle changes the resistance changes through the metal contact
it is then basically sends that signal to the ecu which calculates the current load on the engine, how much throttle input your giving it, the gear its in, and what its revving at currently,
it then decides when appropriate to change gears, calculate injector pulse (along with other references) where to position the throttle butterfly, cam phasing and variable intake manifold (if fitted)
thats just amongst other sensor inputs etc,
as for inter compatibility, im not sure, you would think they are the same to make production lines easier but who knows
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