Here are the joints I desoldered. I pressed the cap with a flat screwdriver and the legs popped out when I heated the solder.
I stuck in a 10uF 10V cap and tested it by putting 12V across the +ve ( RH pin) and Earth (center pin) connections at the back of the gauge. It seems to be working fine now ( the LED stops flashing after a few seconds) but I’ll wait for the right cap before closing it up and reinstalling it.
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