lpg gauge not working

Hi the lpg gauge on my hijet does not give a reading of the level the gauge itself seems ok is there a fix for the sender unit any help would be great also does anyone know of a lpg fitter in the reading area thanks

Can't remember some of the names. There is one in Rose Kiln Lane; Reading Autogas at Arborfield at Bound Oak Industrial Estate; McClaren something or other at Hogwood Industrial estate, Finchampstead and Red Car UK in the industrial estate just off the Nine Mile Ride at California.