I'm in the process of upgrading to the juice as i type this and came across a sort of problem. I'm running a carb with no smog management so no computers or O2 sensors. I really need to add an a/f gauge or monitoring system but I have true duals all the way back and this is where my problem is. I would love to just have one autometer gauge but is it possible to hook up 2 sensors to one gauge. or should I suck it up and get the FAST dual sensor monitor and just mount that somewhere instead of a gauge? OR is there any other options out there? I've already spent ungodly amounts of money on a completely new fuel system and 2 stage nitrous system and would love to spend as little money as possible on this last thing.
Help me out here.

 

try a wideband like inovation, am not sure if the fast system is a wideband but if you want two there you go.

 

FJO offers a widebands for dual channels that will plug into one of their guages. And shows you leanest channel.
http://www.fjoracing.com/products/WBAFR/
Take a look.