My fuel gauge has been reading low for some time

I would like to follow the trouble-shooting algorithm as per Bentley 90.13,
but do not have "tester VW 1301"

I suspect this is just a variable resister, but does anyone know what
values correspond to dial settings 55 and 560.

Thank you in advance.

Norbert Froese
Vancouver, B.C.
84 Westphalia