Bad gas gauge?

are you measuring amps or ohms ? you keep saying ma or milli amps but saying resistance which is ohms.
are you measuring between the blue wire and ground ? ohms or volts
are you measuring in series ? amps.

and please don't lecture me on ohms law, I am not the one that is confused.

Good point. The meter must be set to resistance, ohms.

What model is your meter, or post a photo of it?