Battery > Ignition Switch > Ignition Switch Circuit 15 (switched 12 VDC) > Fuse Box > Instrument Cluster > Charge Light Bulb > 2-Pin Connector over the brake booster > Alternator Field Connection
You would only have to add a diode (cathode toward the Field Connection) if you have run-on issues when turning off the ignition switch (when using an MSD-6A for example).
Link to 924S Schematics below (should be almost identical to an early 944):
https://www.dropbox.com/s/tipsgc0alga5g6w/924S%20Schematics%20HQ.pdf?dl=0