I got this Proline_Mark_VII_pump stand manual from the 1980’s from Daniel the other day. It is a pretty complete document for your Proline car wash.
This is an Infa-Red Coin Switch…. I purchased some equipment one time that had these acceptors installed. I should have kept the historical coin acceptors. 🙂 The next picture shows how simple the system is. 🙂 But I have always thought the unit was over engineered. 🙂 Another issue is not being stainless…. Later it was made out of ss though.