Preparations for the fuel gauge

I want to be able to display the charge level on the Audi A2 fuel gauge. In order to do that I have to be able mimic the tank level sensor. The sensor is a variable resistor with a resistance of 300 ohms when empty and about 75 ohms when full. I will have to mimic that variable resistance according to the charge level of the battery. I have not yet figured out how to do that but yesterday I made preparations for this by installing a wire from the tank level sensor contact (which goes to the fuel gauge) to the EVCU. I also soldered a 100 ohm resistor on the end of the wire to make the fuel gauge go "almost full" and not signal empty tank with an annoying beep.

Measuring the tank level sensor resistance

Soldering a wire in place of the old tank level sensor contact