Air line routing: 1/4" airline from primary 2.5 gallon tank 1/4" port to frame rail.
T fitting at frame rail :
1. in from primary 2.5 gal tank
2. 1/4" airline to pressure switch/ relay
3. 1/4" airline to rear of Jeep for air outlet.
wired up: Viair pressure switch with built in relay.
Fused positive from battery terminal to pressure switch/relay
Switch line from AUX4 pigtail to pressure switch/relay
From Pressure switch/relay, ground wire to screw near firewall on driver side
From Pressure switch/relay to positive wire on...
I actually mounted mine today/ will finish up tomorrow with details and tidiness. I actually mounted mine underneath using the HAUK Offroad M.U.L.E. skid system with a Viair 2.5gal. tank. PM me for specific questions and I will help the best I can.