i have an fs 1/5scale monster truck.2wd version.i want to upgrade to twin steering servos like in 4wd vers.chassis has all mounting points but do i need to change my receiver or can i just solder in parralel?no standard 2 ch receiver can have 2 outputs on the same channel.

You need a "Y" harness

http://www.servocity.com/html/6__y-harnesses.html

thanks for your help.looks like i can prob just solder it up and heatshrink myself.shouldnt be too hard at all!