Fuen Gauge problem after cluster replacement. HELP
 

Hi,

Today I replaced my 1987 944 NA original instrument cluster, with a nicer one that I bought few months ago to a board member.

All gauges are working properly. Old fuel gauge was reading 1/4 tank. Then when I replaced the cluster fuel gauge started to read 3/4 tank. I drove few minutes and take some hard turns to see if the sender was out of place but gauge stayed rock solid at 3/4.

I proceed to add 20 liters of gas, and now gauge is reading steady 4/4. I drove few miles to see if gauge went down, but nothing happens.

There's any chance gauge is out of calibration? Any help is welcome.

Sender was reading about 20.1 ohms, that I supposed is about 2/4 tank, and needle was at 4/4.

Use your finger to make sure the needle will move to 4/4. I just replaced my cluster and the fuel needle would only manually move to just above 2/4. I took off the needle and adjusted so that it moves from 0/4 to 4/4. I filled up the tank and it now reads 4/4.