We bought this 2004 ford f150 xl (2FDPF17M34CA17056) mileage (75749) which was a cng fleet truck on 05/03/2019 which had to change over to gasoline due to the price of the replacement tanks, so now we had to change the computers, pcm, abs, airbag, cluster, and steering column to a pats system. So, the pcm that is now in the truck (1FTRW08L21KF50570) mileage (155927.5) which i like to get back to the original (75749) all the smog stuff are hookup per california laws, still, need to make sure the speedometer is reading the sensor right. On our test drive we found that the gps shows we are doing 35 mph and the speedometer is showing 95 mph, so is this something you can do for us?.