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just plug one into the other. . .but you need to make sure you have them connected up properly. . .I would say you need to let the edge see exactly what the engine is doing, so connect that first. then use the other box to fine tune
it works like this. . .I know both use the MAP sensor. . .you unplug the stock harness, plug in the edge connector, then where you would plug in the stock harness into the edge, you would plug in the other module. then the stock connector into the return, and so on.
it will plug into each other, you just have to be carefull in what order you plug them in.
both of the boxes have a plug for the diagnostic port and you need a wireing harness to replicate that port in series to finish the install the rest is basic and i already have the two chips