ignition module

Hello Classic Opel Community. My first post here. I've got an Opel Kadett E 1990/91 16SV engine (Pierburg 2E3 carb) The ignition module is the Siemens EZ Plus 5WK6 221 (GM Part No 90 340 026) and it's mounted prominently on the firewall/bulkhead. The Haynes Manual wiring diagram shows a...