Restance of air flow box

[smokingwheels]

Hi Back again

My Z Has sum sort or strange restance device in the air flow box.

It goes from 50 ohms to 350 then 50 ohms to 350 etc as the flap opens up.

so how can i log this?

It looks like it has sum sort of reed switchs taped on the slider, with a steel rod that goes over them it seems to reset the restance after passing one of them

Its a 79 Z EFI

I could post a pic if needed