On each side of the stock power button, solder on a positive and negative lead. Note that the side closest to the bottom is negative and the positive is more towards the body
Next, install your banjo fittings/ qev as normal to the body and position your wires to run down the back of your solenoid.
Now Slide the board down the grip frame making sure the wires dont get pinched and stay in position.
Here is what it will look like settled in all nice and snug
Next attatch your membrane making sure to clean the surface where you want to mount it with rubbing alcohol to ensure a great adhesion. Wrap the exposed clear plastic with electrical tape so its not as vulnerable to damage