As title.
My 1408 gauge is receiving 1432tpm so it should be close to accurate. But its speedo over-reads 16%, And its odo under-reads 12%. I have no idea what clever-dickery has been inflicted on the poor thing in the past. But undoing whatever it is, is surely too much effort to be worthwhile.
If anyone has an unmolested one in reasonably tidy order...