hi
your better off get yours repaired or just swap the fuel gauge
the dash is part of the security system and if you swap it the car wont start again
you would need the dash recoding to the car before it would run again and the mileage cant be altered
can only be done with Jaguar IDS/SDD software, either main dealer or a indy with the software, either way not going to be cheap
also if you google dash diagnostics you can put your dash into diagnostic mode and test all the gauges
http://www.bluejag.co.uk/S-Type Instrument-cluster-diagnostics.php
http://www.bluejag.co.uk/S-Type Instrument-cluster-diagnostic info.php