Schematic for Andial signal splitter for twin plugged Carreras?

[polizei]

Guys,

Does anyone have a schematic drawing of the Andial signal splitter that facilitates twin plugs on '84-89 Carreras? 2nd place would be seeing a picture of what's "under the hood" of the splitter. Specifically, this area:



I'm interested in running knock finding/mitigating system and need to share this information with the system manufacturer - John @ J&S.

Thanks!