Does anyone have experience with replacing or rebuilding a Signet SL 80 instrument head. The factory can replace for $650. They may be able to repair as well. My real question is can I leave my wiring and transducer and my wiring and paddle wheel in place and hook a lowrance or Garmin head to it? I've tried to purchase a used SL 80 but have had no luck. Any ideas? Oh, my vessel is a O'Day 272LE. Thanks.