Diagnostic port tool/instrument

ES 1800

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My buddy made the remote start switch to connect to the diagnostic port of my '73 CS. It's a thing of beauty. I See pic. have looked in my big two binder service manual, but I don't see what the tool or instrument was that was originally used with this port. Can anyone help me with this, perhaps with a photo?
20251225_182919.jpg
 
There were 2 diagnostic ports, the one on the thermostat housing for ignition data, and the other on the driver fender for starting and 12v. There was usually a Bosch diagnostic device that they went to, not unlike the old school Sun machines.
 
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