I have been struggling to get a hall-effect I had on hand to work with the 36-1 toothed wheel. Above 4k RPM the signal would have problems. I think they are because the sensor (from a '96 Dodge 3.3L) isn't designed for this setup (wheel thickness and RPM.) So yesterday I ordered the tabbed hall-effect sensor from DIY AutoTune. I went back and forth between the sensor and fabbing a 18-1 wheel. The sensor should allow me to reuse much of my existing mount and should work for as much RPM as I want to throw at it...

I confirmed with Matt that they had them in stock. The web site was indicating that they were on back-order. Luckily the order had just arrived.

As a side note, I confirmed that there threaded body hall-effect would also work. I was concerned about the 85C temperature limit. For an external mounting of the sensor I should be fine even in the conditions I saw during last year's Drag Week.