Just finished documenting a conversion from a stock CAS to a 24-1 trigger for a MegaSquirt. Thought I would share the writeup, as I couldn't find anything 7M-GTE specific before I started.
http://www.saturnwiki.net/index.php/Nippon_Denso_CAS
http://www.saturnwiki.net/index.php/Nippon_Denso_CAS