Speedo / Tacho - dash diff to PFC reading?

[raz0r$harP.UK]

Hey,

Just noticed that my speedo / tacho readings on the dash are out compared to what my PFC Commander is telling me.. by about 4% or so.

I'm guessing the Power FC is showing the correct figure (is this right??) .. does anyone have recommendations for someone in Sydney who'll fix this?

Thanks.

[RiverSide]

I found the same thing......I would suggest having one of someone drive beside you at a few different speeds in their new or near new vehicle with stock wheels and tyres (their speedo should be accurate) and just figure out the reading on your speedo and allow for the difference.

I would be very wary having your commander sitting in your car all the time, it will let theives know what you have in your car and drunk friends might mess with your settings whilst you are paying for fuel etc.