58 Pa. Code § 185.161 – Pari-mutuel wagering.

(a) Associations shall use vending machines for the sale of pari-mutuel tickets, unless otherwise authorized by the Commission. All associations shall be required to utilize total electronic calculators approved by the Commission.
1. (1) No electronic calculator may be deemed one of approved design unless it is capable of registering by automatic electronic or mechanical means on central aggregators all wagers made on each horse, entry, or the field, in each of the straight, place and show pools, and displaying the totals so registered in such a way as to permit ready tabulation thereof by the representative of the Commission.
(b) The controls necessary to operate the odds board in the infield, relative to the way the horses finish (if the finish is being contested, if there is a photo, dead-heat, time of race), are to be located in the judge’s stand and controlled only by the presiding judge, or one associate judge designated to do so.