[jclark003]

I believe Garmin autopilots use a proprietary pump which would mean you can't reuse your existing pump. By the time you buy cables, tee's, wiring and fittings the parts will probably cost around $4,500 or so. If you are comfortable with marine wiring, N2K networking and hydraulic fittings, installation is pretty straight forward. Garmin has some decent videos that show how to install step by step. Location of compass is important for AP to operate correctly.

I would guess an installer would have the job done in a day and it may well be worth it in the long run. It is after all tied into the steering hydraulics. Anyone who has had it happen will tell you that loosing steering is no fun. And it usually happens at the worse possible time.