Melexis 90217 Hall-Effect Sensor
Short circuit protection
Rotary position gear tooth sensing ability (using a magnet is better)
On-chip 10 bit A/D converter
Self-adjusting magnetic range
High speed operation
No chopper delay
Zero speed detection
No rotary orientation concerns
It is normally pulled high and goes low when it detects a magnets south pole. It should be real easy to watch with the IFI controller.