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Try trigger wheels, they mainly do engine trigger wheels but I think theygave branched out a little. Other options include using an abs ring on your driveshaft or bonding some metal lugs onto the driveshaft or other rotating part. If you have 2 piece discs you can use the bolt heads as the trigger lugs if you can get the sensor in there safely
I would have thought that you should be able to calibrate the speedo regardless of the number of slots, as it should be adjustable for different tyre sizes/ diff ratios etc.
The Speedo can be calibrated however from what race parts told me it can only be calibrated so far.
It requires a disk with basically the right number of slots for the tyre size and diff ratio.
I am panning on fitting the disk around the prop shaft flange from the gearbox. I therefore need it to have the correct number of slot and also be a certain size.
I’ll give both suggested company a call. I knew about ETB but not that they made ‘slotted disks’