Where to connect the other end of the launch control switch?

I am installing a launch control switch to my car, i will connect the first side of the switch to the DET3 Analog #4 in.
On the DET3 - User Manual manual pg.42 , it says “To activate the launch control, apply 5V voltage to a chosen analog input.”
I just thought of an idea and correct me if I’m wrong that I can connect the other end of the switch to pin 12 (+5V out) on the DET3.
If I’m wrong i will appreciate guiding me on installing the launch control switch.