In this video I repair the fuel gauge circuit on a 1987 Porsche 944. The sending unit should read 2.8 ohms for a full tank. There are multiple connections throughout the circuit that each add a little bit of resistance if they are not clean and tight – just adding a few ohms will bring the gauge down noticeably. I step through the connections I cleaned that made the gauge read a lot more accurately.

While I had the cluster out, I also changed some of my indicator bulbs to LED to increase their brightness. I got mine from:
https://www.superbrightleds.com/b8-le...
You need the B8.5D LEDs and select the desired color to match the indicator.

On the left side you need 3 red for Brake Pad, Seatbelt, and Parking Brake, plus 2 green for Parking Lights. In the middle is 1 red for the main warning light and 1 green for the turn signals, and on the right you need 2 red for the brake fluid and 1 blue for the high beams. I did not change the warning lights for oil pressure, battery, fuel, or temperature, as you have to take the cluster further apart, same with the CASIS/shift indicator that takes an amber LED. There are several unused indicators that may or may not have bulbs in them.
So in total for the LEDs accessible on the back, it’s 6 red, 3 green, and 1 blue, at least for my ’87. You do need to pay attention to polarity on LEDs, so you really have to try them before fully installing the cluster – if they don’t work, turn them 180 degrees.