Good afternoon I am trying to replace an Autohelm ST4000 Wheel Drive autopilot (the one black with the small plastic wheels inside) in my 95 Hunter 29.5 with a brand new Raymarine MKII Wheel Drive unit (color gray) but I am not sure if the new wheel drive unit will work with the rest of the equipment, does any one of you knows if it will work or not with the rest of the equipment from the old Autohelm St4000? The MKII wheel drive unit is a little bigger in diameter and the motor would require a new hole on the pedestal but before I go and modify the pedestal I would like to hear if the control head and compass from the old unit will work with the new MKII unit. Thank you in advance for your help and advice.