The flat black conector must be for a CA because blue and wite wires are on either end of the shunt. I can't see an ignition wire. With nothing except the battery connected, you can see if the 5v becomes active. If it is, you don't need an ignition wire. The pink wire carries battery voltage, but I can't see any return, so it could be just for throttle LEDs or similar; however if you look at the third and fourth photos where the date is written at the top edge of the pcb. That track runs all the way along the top edge to the big resistor R63. The other end is hidden under the bundle of wires. Any wire that is soldered directly to that track would be the ignition wire. There could well be one. What else could that track be for?
You could use your meter to test. Set it to check continuity (beep). With one probe on the left hend of the resistor, any wire that beeps when you touch the other probe to it will be the ignition wire, except the pink one.
