I agree with Diesel Nut. Gauges are definatly a safe thing to have.
If your dealership is going to get strict then id look at getting a recipt for your pyro getting installed. I'm not sure how your pyrometer was installed but Id get a recipt saying the manifold was removed drilled cleaned and re-installed. If you ever have turbo problems the dealer could say it was from shavings from your pyro.
Thats how I did mine. Better safe than sorry
