The Pressure Mat accessory requires one connection to ground and one connection to an Input. The input pins on the BRNKL's green connector span from Pin 4 through Pin 7, which represent Input 1 to 4. 

It does not matter which of the two wires go to ground and to the BRNKL Input. 

*Pro-tip: Instead of running a ground wire all the way back to the BRNKL connector, you can connect the ground of the pressure mat to any ground on your boat!

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