If you have Perfect Pass, you could just run the water temp sensor out the speedometer tubing hole on the transom for the speedo you no longer use. That's what I did. Air temp sensor just sits in the dash (out of direct sunlight).
Previous: 1993 Prostar 205
Red 1998 Ski Nautique, PCM GT40, 310 hp, , Acme 4 blade, Perfect Pass SG/Zbox.
Be kind. Have fun.