power supply to fuel gauge

[checkrail]

Hi, I've disturbed the wireing behind the dash on my +2 S130 and the fuel gauge has stopped working, I checked the voltage stabiliser looking for a power wire for the gauge but the only one supplies the battery conditioner gauge..
I can see a blue/white wire connected to the back of the fuel gauge which goes into the harness, the battery gauge is working fine and the fuse is o.k.
Any help would be appreciated, Thanks John