I have a 1991 Emerald Spa that has been refurbed with an AP1400 Spa Builder Supply complete pak. The topside control has a six pin standard plug but the controller does not have a plug. The case is marked for a "Topsides" plug but no plug installed. I have located the plug and was wondering if anyone knows if a plug can be installed and the topside controller used in a safe manner?

If you can, open the spa control panel and take a couple of good digital pictures (and post them). Then I'll be able to tell you to connect what - where.

I could just go off of a schematic but since these things tend to change over time, it's safer having a photo of your specific control.