Is this trigger wheel (2 teeth on iron/steel disc)
possible to use with this Volvo sensor ? A: It's possible but requires to modify the VEMS box because VEMS rises the sensitivity so high between two trigger events that it will read every metallic crap between them. MembersPage/JoelZernask has similar setup (pins and VR sensor), but on V8 w/4 pins. He had to modify it to work ok. Contact him and ask for details if needed ( zernask@hot.ee ).
The Volvo sensor is most likely inductive, it measures 160 Ohms between two pins and one pin has no connection to the others (shield). I vote for Honeywell GT1 but this sensor is free (not my choice).
Here is the car, work in progress, just painted after all body and chassis work:
