Charlie,
From my EC3 manual. CAS Pin A is shown away from the CAS mounting tab. CAS Pin B is shown closest to the mounting tab.
Bobby
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Monday, June 20, 2016 3:35 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Renesis crank angle sensor wiring?
Anyone remember which pin (2 pin Renesis CAS) goes to which EC2 terminal (pins 22 & 23)? I found one note that mentions the 'A' terminal, but my CAS has no marks, & I don't have the connector from the car.