Adding gauges 06+ Peterbilt?

Recently bought a new to me 07(built in 06, no DPF) Pete 385 day cab. Truck has only 1 extra gauge after the 8 standard ones in front of steering wheel. wanting to add a few more gauges, wondering if anybody know if all the wires/plugs/sensors for some extra gauges are already there behind the dash? Or would adding gauges be a big project? Just thinking they may all have all the plugs and sensors pre-wired going down the assembly line, then they just plop in whatever gauges that truck is getting.

Thanks

 

Thanks for the reply. What are the pop outs you're talking about? My dash doesn't look like it has any pop out things from the front. Never been behind it yet though. As for my gauges, I included the speedo and tach as my 8. So no trans and diff temps. I do like gauges. But If it wasn't gonna be too hard I would have liked to add a trans, diffs, and maybe like an exhaust temp or so. But not gonna have the dealer do it I don't think they're that worth it...I did just buy the right weigh dash gauge I'm gonna install soon for my drive axle weight. Is there an easy way to cut a 2 1/16 hole in the dash?

Thanks

 

Thanks again. Gotcha. Yes I run a T off one of my air bags. Then run that line up to the gauge in the dash I'm gonna put in. Do you know what the best/easiest way to run the air line from the axle to the back of the dash would be? To the engine bay and through the fire wall? Or where. Thanks

 

Got the air line run through the firewall and up to behind my dash where I'll cut for my gauge. It is a 2 1/16" hole to cut the instructions say. Anyone know if cutting through the fake "wood" dash is gonna crack it or what not? It looks like it's a thin metal piece then the "wood" is a layer over it. Any precautions I need to take before drilling out the whole on the dash? Don't wanna crack and ruin my dash

thanks

 

Welp the hole cut nicely and got my airline tied into the airbag and no leaks anywhere! Gauge shows a reading. Gonna calibrate when I get loaded next. Thanks for all help everyone! I appreciate it!