Dashboard fuel gauge, which resistance? (Ohm)

Hi, new here. I'm a Dutch K11 driver. My Micra drives on LPG. No space in the trunk, but cheap!

The fuel gauge on the LPG tank is connected to the meter in my dashboard. This is kind of abnormal (normal there is a separate LED-meter for the LPG tank). The problem is that the meter works incorrect:

-from 80%-60%, the needle is at 100%
-when lesser then 60%, the needle is dropping.
-at 20% the needle stops at 50%
(a LPG tank only fills up to 80%)

The problem probably is that the fuel gauge at the tank has the wrong resistance. I measured and it goes from 5 till 75 Ohm. I want to add some resistors, but then I need to know the resistance of the normal fuel gauge.

Doen anyone know from which till which resistance the fuel gauge in the dashboard works?
 
my gauge is the same kjiratsiek fwn its got 4 led bars, and 3 bars is 1/2 full lol, i just keep my eye on the milage, and when its done 100 miles i put another tenner in
 
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