Just to update, it has been fixed. I was watching Telegram on YouTube and thought what would he do. So I went in the garage looking for anything that would have a jack. Luckily I still had one of my clients old Rain Dial timer that I replaced with a wireless timer. The Rain dial had a jack and it was a 6pin. So decided to desolder that one and put it in the RMK SL1. Before putting the box back together I tested it and it works. The box did have to be modified with a dremel so the jack would fit. It seems like I have to recalibrate the PH. It’s showing 5.6 when it should be 8.2.
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