I bought a wash with the Coleman SNC system about a year ago and did away with all of it. I purchased new
doors from Carolina Pride and went with rotary switches, Dixmor LED6 timers, added bill acceptors and Cryptopay. I used 12 position 3 stack rotary switches to make it easier to control the low pressure solenoid for the presoak and rainx functions. Since I put everything new I just wired them up on the bench with molex plugs and when I was ready to change over I cut the wires from the old
doors and put the molex plug on it and just plugged it up. It was a pretty easy process and I've had no problems since doing this. Takes some time if you're going with the molex plugs to put all the ends on.
On the vacs I purchased new
doors from Coleman, which were cheaper than the decals, and followed the directions I found in an old post on this site to add the push buttons in place of the keypad. I also went with the Dixmor LED6S timers on these. Getting rid of the keypads on everything made things much easier and a whole lot more reliable.