Anything and everything Spitfire.

Alternators, dynamos, lights, wipers, etc.

HI, CAN ANYONE PLEASE HELP WITH MY ONGOING SAGA OF THE FUEL TANK SENDER UNIT. I HAVE A 1977 1500 IN WHICH THE FUEL GAUGE ONLY READS JUST UNDER HALF FULL EVEN WHEN CLEARLY FULL. I HAVE REMOVED AND EXAMINED THE SENDER UNIT WHICH HAS AN ARM OF ABOUT 8 INCHES. I MET A FELLOW SPIT OWNER AT A SHOW RECENTLY WHO KINDLY SWOPPED OVER THE LONGER ARMED UNIT FROM HIS CAR TO MINE AND HEY PRESTO THE GAUGE READ CORRECTLY. I HAVE SINCE TRIED TO SOURCE A REPLACEMENT SENDER UNIT OF THE CORRECT SPECIFICATION BUT ALL THE DEALERS TELL ME THAT ONLY THE SHORTER VERSIONS ARE AVAILABLE AND THAT INDEED THIS SHOULDN'T AFFECT THE READING IN THE GAUGE. THIS LEADS ME TO THINK EITHER THAT I HAVE THE WRONG TANK OR THE WRONG GAUGE FITTED! I AM NOT CLUED UP WITH ELECTRICS SO IF ANYONE CAN HELP WITH ADVISE ON WHAT THE REASONS FOR THIS PROBLEM ARE I WILL BE VERY GRATEFUL..