Is this the right cable?

[bunker108]

I tried over in the Merc forums but havn't had any luck. I would like to get this ordered asap if it is the right one. Can any one verify if this is right for a 73 SS18 with a 1972 Mercury 1150?

http://www.iboats.com/Merc-Control-...6512699--**********.682145014--view_id.169455
Thanks!