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X 2 agree with above it may just be a bad connection or a bad earth

Check the wire hasn't shorted out to the tank sender.
LPG gauges are often fairly innacurate, but failures are usually the wiring or the gauge at fault

taslucas
This may be of help?
68128

What Bloggsy said X 2

If it only happens when it rains it is a good chance it is the Scrivets in the Scuttle Panel.
If you reach up and the joiner in the duct is dripping then make that 95%...

A couple of places to check.

1. Grill panel under windscreen (outside) is held on by some scrivets (or whatever they are called). I believe these sometimes these go walkabout especially if the...

Being a TI have you got a sunroof? Maybe the drain hose is blocked that runs down the A pillar or there may be a hole in it somewhere