Okay today I tried to fix the accuracy of the speedo, I followed one this method:
I clocked 25.5 km on the odemeter and 24.6 km on my GPS.
25.5/24 * 2661 = 2758
I have 05' F-150 using 33x12.5x20 Toyo Open Country MT's.
okay now the problem of putting this number in. I have selected the custom tune and custom settings, put the above number and selected done. After the turn off and one process, I'm not sure if the number was stored there. Because when I choose the custom options again I see the old number 2634 not the new one 2758 plus there is no difference in the speedo adjustment
Test in KM
Gryphon / Speedometer / GPS
36/40/34
55/60/53
75/80/72
113/120/109
I really need to get this working, I had 4 tickets because of this issue and cost me the price of gryphon!!
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