http://www.amazon.com/Connector-Yell.../dp/B004EFK6LK
This in the correct wire gauge is what we used to do that exeact application. When hooking up the GPS to VHF and with other electronics. I remember replacing the T-Top canvas on a 34' Fountain that took a wave over the bow, the radar didn't have a quick connect but instead a hard splice that we used those connectors to splice up.