Welcome to iboats adruid! The part number your looking for would be 97257A1. Item #5, http://www.mercruiserparts.com/Show...desc=WIRING+HARNESS+AND+ELECTRICAL+COMPONENTS
Your parts catalog. http://www.mercruiserparts.com/selectDocs.asp?doc_nbr=41261
Available here on iboats. One hint: For easier installation, Try to get the Mallory unit as it comes with the needed sealant already applied same as OEM. 97257a1