Right. Three threads merged into two, off topic posts removed, threads re-titled.
Omeoman, do not cross post. This just makes work for a Moderator to clean up the mess and won't be appreciated.
Now, the Stealth Throttle Controller does have the option to connect to a reverse wire so that the controller does not operate in reverse. Good idea.
In both the Fourth Generation Tritons and the Pajeros Mitsubishi do have a reverse wire in one of the looms under the console. It's reasonable to expect that they've probably done the same with the MQ,
So, a little investigation finds....
From the online manual
Reverse_camera_MQ.png
The connector locations
Dash_connectors_MQ.png
and
Dash_connectors_2_MQ.png
From these I'd figure that you should be able to pick up a reverse signal at Connectors D22 or D247.
Would need in vehicle verification.
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