If you are going to add the electronics I also recommend the EGT and boost gage. The EGT is critical to know how hot the turbo is getting and the boost is good for monitoring functionality. If your boost drops you will know it in engine performance but the gage will tell you why. If you have automatic then I also suggest the tranny temp gage. My upgrade included a larger waste gate raised boost pressure by 10 pounds.
I might notice my better mileage if I would stay off the "GO" peddle showing off.
Good luck and safe towing.
Cheers,
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