Primera reverse camera

If it's a manual box there is a good chance it operates off a switch on the gear box - the one that normally does the reversing lamp. Wiring a switch across the pair of wires or if single wire to the wire and earth should do the same as the internal gearbox switch. You also need a second switch or a double pole switch to switch off the reversing lamps. If the ECU gets the reverse gear signal and processes it to limit revs or something else you are sunk.

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