Ok i bought this voltage meter. it has 4 wires coming off it, 1 red 1 blue 1 green 1 black. i emailed the guy how to install this thing and he said this:
Red+/Black-: power the meter by 5V Blue+/Green-: Input from 0V to 100V
do i need a resister to get the 5v or what? and where should i get one at if i do?