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Those dials aren't very common I don't think. I found an old thread on difflock with pics of another person who has them and was also having issues finding a sender that reads correctly
My dads is an 88 spanish model and his dials are different and have a rev counter, we're not sure if it has the original ignition system in it though so can't compare.
It always seems to be the spanish models that have oddball parts fitted

I think your best bet might be the sender from suzuki even though it's quite pricey.