Nissan Timing Wheels
Having looked at the Nissan Silvia and 200SX models (S12, S13 and S14) they all use a cam driven timing wheel with a speed sensor of 2degree resolution and portals of different sizes to denote the current cylinder.
This is going to be implemented in a future firmware release.
Ask MembersPage/FredrikJagenheim for more information if you're interested in this.