With the garage not working today I thought I would take a look for myself, removed the black metal cover and noticed the arrow on the fuel pump wasnt lined up with the screw hole, so, loosened it and twisted it to line up, tightened it up and turned on ignition and now the gauge is working. Think I will either do jobs myself or take it somewhere else as although its free getting it done at work, they dont seem to be giving it the attention they should and missing simple things.
But all good now and with no cost, so I'm happy