my understanding with the DRAC and dip switch was so you could calibrate your speedo with the different tire sizes and rear end gearing , and with all the combinations with the dip switch on that site I can't see how it will only correct by .5. Has he even tried a DRAC with dip switch, at the local pick n pull I pick up a DRAC for $5 and a dip switch for like $1, for $6 it was worth the try
