ZL dash repair

[Garfsxy]

I have a ZL Fairlane dash that everything works on except the fuel gauge, it just blinks. The dash goes through full initial startup mode then the other 3 settle but fuel gauge keeps on blinking even with 3/4 of a tank of fuel. I bought the car from Lloyds auctions in NSW in April and it now resides in WA. I can't register the car until the dash works fully. Does anyone know of a tech or whatever that knows all about diodes. I have extensively eliminated everything including the sender and vehicle earths in case we start a did you try this thread.