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You could take the sending unit out of the tank, hook the wire up to it and slide the float up and down to see if the gauge moves up and down. Taking the instrument cluster out only takes like 15 minutes, it's possible there is a loose or corroded connection there.
Current:
2016 Cayman S
Former:
94 968 Cab 6 Spd. Black/Cashmere D1R SC
86.5 928 Garnet Red Metallic
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I like the idea of taking the unit out of the tank. Rotate it end for end and it should go from full to empty. If it does not, check to see if it looks OK. When I repaired your old sender I found that the top of the aluminum cylinder was badly deformed at the top so the overall length was about 3/8" shorter than it should be. It also had one of the two rods that the float moves up and down on that was bent not allowing the float to go all the way to the bottom. Looked to me like the bent rod and the deformed top piece were connected problems. Could there something in your tank that smashes up against the bottom of the sender when installed and deforms it so it won't allow the float to go always to the bottom of the travel? Probably not your issue, but you unit was deformed from something either in the tank, or someone had overtightened the nuts on the bottom of the sender.
If the sender unit looks good, and when you flip it end for end the gauge doesn't go from full to empty, then you should look to the gauge.
'92 Midnight Blue 968 Coupe
'94 ProbeGT, Eaton SC@9psi, Quaife, TecGT ECU, 300+HP, body sold, parting out
'98 3000GT VR-4, 400+HP AWD beast, didn't fit w/race helmet, Sold
'93 Bone Stock MX-6 Sold (in '05) sadly to the crusher in 2010
'61 Triumph TR-3, White with red leather interior; My First Car
