I do not plan on using the pule disc from the mouse, just the encoder from a newer one. It will be driven via a gear that would provide about 3 rev per single rev of the antenna giving at least 1000 pulses. As far as a zero point, I was figuring on using a push button for that part. I would like the display to be accurate as possible even thought +- 5 degrees is close enough.
I am still planning all of this.

Bob