Re: Nissan controls
The current RC box for that motor would be 383Q843504, RC BOX, RC8C (NSF8A3/9.8A3-w/elec. start), AMB, $386.13. It would be painted the new "aquamarine" (almost black) color, and would have the key start with push-to-choke feature. If you want the original color scheme and key start (with push to choke), you would get 383843503M, RC BOX (RC5C) NIS, ELECTRIC, 5//8/9.8/9.9/15/18/25/30/40C, $386.13. If you prefer to keep the push-button start at the motor, and skip key start, the appropriate original-color RC box is 373843602M, RC BOX (RC5D) NIS, MANUAL, NS5~40C & NSF4/5/6, $312.32.
Regardless, you will need 3A1838801M, SRC KIT;9.9B-18C,25,30, $172.32, which will come with the hook plate for steering. You may need a 346849051M, DRAG LINK ***'Y, $70.96, to attach to the steering cable, depending on the setup you get. If you will be running the old 2-cable "tiller cable" steering, the hook plate will suffice. If you will be running the more modern Teleflex-style single steering cable, you will need the drag link.
Keys are available from any dealer, including me, (as are the rest of the bits you will need). You just need the key number, which will be on the switch/lock housing. You can read that once you open up the RC box. Cost is $16.22 for a pair of keys. If there are just a few short wires coming out of the control, those are probably intended for the tach and other instrumentation. If they are enclosed in a longer harness, say about 4.7 meters, they are supposed to route back to the motor. There is also a 2-meter extension cable available.