Originally I was planning to use 32 magnets, giving me 128 pulses per revolution. I tried some test prints and came to the conclusion that this was a bit overkill, eventually I continued with 16. 

To give some tactile feedback, I added a clicker that clicks on every quadrature step. The clicker consists of a (round) track of 64 shallow (0.4mm) pockets in the base plate and a 4mm spring loaded ball in the dial.