I posted some details of my MicroSquirt configuration and install over at the Mazda626.net forum. All the info applies to the '93-'97 2.0L Probe motor too. I'm not gonna maintain the info in two places, so look for it here:
http://mazda626.net/topic/45622-mazd...d-microsquirt/
http://mazda626.net/topic/45622-mazd...d-microsquirt/