Speed-cal Help

[JDwhite98gt]

I need some help figuring out the correct dipswitch settings for my 3.27-4.10 swap and 295/30/18 tire size on Faleens. I know how to install it and how to set it up just for the 4.10's but how do I average in the tire size? right now my speedo is 10 over under 50mph and then anywhere from 20-25 over above 55mph. Thanks

 

[DropTopPony]

you need to set the trip at 0 and have a chase car with reliable odometer. Get on the freeway and sync the 2 cars together at 0 then drive until the chase car hits exactly 10.0 miles. Record what your trip says IE: 9.2 miles or 10.8 miles etc and call Dallas Mustang and tell them. They will then give you the exact setting for your car to be accurate.