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Brad,

If you're doing the PDI upgrades, then they would be:

Stage 1 = Tuner
Stage 2 = + Int/Exh Manifolds
Stage 3 = + Turbo

If PDI is doing the work, then you're set; the PDI Tuner has all the temps guages you'll need.  They work on CATs all the time, and if you don't have the sensors, they'll be able to add one.

Weird, on their website they call the complete package purely Stage 1 on the Cat products.  I plan to have my mechanic tackle it, I am just trying to wrap my mind around the best way to get me what I want.  Assuming we can't get the EGT to feed into the ECU/ECM so that I could be either read by their tuner gauge and/or Silverleaf I was able to find some nice people at Teltek that can special order any length of cable that you want for one of their digital EGT gauges.  I think I would prefer digital to analog if I end up having to go the separate gauge route.    

Fun times ahead.  Just love the concept of increased performance along with cooler temps, etc.  Lighter wallet, but that's the case with anything we do.