true, that does not test the meter itself. only the supply to it. i didn't read it before, just sent you the screenshot.

i am about to pm you another screenshot with the ecu pin out data and what you can measure there to test the MAF. but if you are not overly confident with electronics, perhaps you ought to have a local specialist on the case.

but there are many other faults that could cause a lack of power, so ideally you need an ODB diagnostic device to connect to the ECU to read the MAF when running and other things like accelerator pedal sensor etc