Bikini Girl is one of the first avatars I swiped YEARS ago. She's cute and makes me smile.
As for the speedo, both posts were correct. The Speedo on the dash is always going to be slightly faster than the ACTUAL reading from the PCM. Ford designed it so that it always appears that your driving a little fast. In fact, most manufacturers do it. This does not have an adverse affect on the odometer, though. This always must be accurate.
As Jack said, if you set the speedo so that it is on spot with the GPS, the odometer will be inaccurate. Always best to line the GPS and the Gryphon (or Evo) up so they match and just live with the idea that the odometer is always off.
One other thing to keep in mind, in order to make a 1 KPH difference at 100 KPH, you need to make a roughly 1% difference in tire size. This means that if you are currently running 2530mm diameter for your setting, you'll need to make a 253mm change to get 1 KPH. Increasing diameter increases the calculated vehicle speed and reducing the diameter reduces the calculated speed.
Hope this helps.
__________________
Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
(678) 890-1110
www.gopowerhungry.com - Home of the Hydra Chip, Minotaur Tuning Software, and the new Orion Reflash System for Navistar!
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