Replacing 22 year old Autohelm ST50s

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Bryan,

Q1. Should I pull all new wire or just replace the ends on the wire that is in place with the new plugs.
A1. While the i50/i60 instruments have been designed to be installed as replacements for ST50+ instruments, they have not been designed/tested to replace ST50 instruments. Accordingly, it is recommended that new power and communications wiring be installed to support the new instruments.

Q2. Will the new depth/temp transducer and the new speed transducer fit in my existing holes/threaded sockets in the hull or do I need to haul the boat and change the thru-hulls?
A2. The currently offered P800/P17 and B17 housing based depth and ST800 housing based speed/temp transducers continue to require the standard 2" [censored] commonly used by transducers which had be offered for use with the ST50 depth and speed/temp transducers.