I put this out for anyone looking to do something with their old Airguide speedometers that have been discontinued around 2005 especially the ones that leak water under the console and onto the legs. It appears replacing the guts with a GPS unit is the cheapest way to go. I looked at replacing both gauges with like gauges but the cost is close to the same. Aftermarket GPS units was more expensive. About everything in the boat is stock so this fix will continue to make the dash look stock. There might be a slight chance of repairing the diaphragm. I happened upon this at another boat website. I'll be going with the external antenna as I want to stick with the stock 0-50mph face.

http://nauticlaugic.com/AirGlide_2017_Packages.html
https://www.youtube.com/watch?v=SwXAfIttEQM
https://www.youtube.com/watch?v=axiv4Gw_N2M