There are some good articles in FP about testing and fitting French senders and gauges but little about calibrating Slough units. I have just had a reply from Speedy Cables who will repair my gauge but it takes 5 weeks (China? India?) and it still isn’t calibrated to my sender.
I am trying out a Series 11 Land Rover gauge which seems to work but is small and a weird shape.
Tony Buxton