I checked mine with GPS this morning and the Gryphon is much more accurate than the Speedo.
At lunch today I went out to check the custom settings of my TS and GR and they were not set to what they should be. So, I reset them using the custom option. I'm using the 87 canned Tow tune until my performance tunes come in (have a CAI) but I got to thinking (since I don't have the manual handy) Do I need to revert to stock before I make custom changes or change the tune level? I couldn't find this in the Q&A's but thought I read somewhere that you should go back to the stock tune before changing to a Gryphon Tune.
I didn't do that in this case (haven't driven the truck yet) an am wondering if I need to reset it to stock then load the 87 Tow with the custom settings.
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