No Battery, Throtle and fwd/Rev control only

I have upgraded my outboard engine from a 20 HP Mariner to a 2004 Mercury 25 HP long shaft. I did not have a battery on my old motor but did have controls for throttle and forward and reverse. I used to just pull start it. My new motor seems like it needs a battery or key to start it. It has a 8 pin plug in but only uses 6 of the pins. It does have a pull cord. I am wondering if anyone knows how I can continue to use my remote control cables for throttle and forward and reverse but put in a switch to be able to turn my motor off and on. I would continue to pull start it and not need a battery. Is this possible? I would appreciate any feed back a all.

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I did about a week ago and still no luck getting a answer.

What is the serial number of the new motor?

http://www.ebay.com/itm/Quicksilver...ash=item464d212d0e:g:SaUAAOSw1DtXIMvK&vxp=mtr
Maybe something like this