According to the PRO-163 manual, the Step (kHz) for 144.0000 to 148.0000 MHz is set to 5.
138.000 - 143.9875 and 148.000 - 150.7875 is set to 12.5. So it is probably not possible with the PRO-163. If you need a copy of the PRO-163 Manual, I have it in PDF form. Just send me an email if you need it.