Connect CAN High from the screen harness to CAN High on your ECU, and CAN Low to CAN Low, using a twisted pair. The E-12 shares the same board as the E-10, so the CAN behaviour and the software setup are identical.
Route the pair away from coil packs, injector wiring and any high current run. On a built engine the noise floor inside a dash is far higher than in a stock car, and CAN errors show up as gauges that freeze rather than gauges that go blank.
Annotated diagram of the E-12 harness connector, CAN High and CAN Low pins labelled on the image.
E-12 harness CAN High and CAN Low wire colours and pin numbers, and whether the VTC Edition adapter loom changes the pinout.
⚠️ Never tap CAN into a live bus while the ignition is on. Cut power first.
Related: CAN Bus Termination and the 120 Ohm Resistor · CAN Bus Wiring on the E-10 · My Screen Turns On but Shows No ECU Data
