In my Corsa, the petrol guage has never worked since the LET engine went in. Today I changed the 1.2 dials for GSi ones, and still no action on the petrol guage!
Occasionly it will go upto nearly half, or anywhere randomly between that and empty, but it will never tell me what I have in the tank!
Anyone any ideas where to check next? Do these symptoms sound like a familiar problem?