It should work. I was told from 2002 on the 300x motors were smartcraft ready. My engines had a harness but it did not work. Had to send my ECU's to Mercury and through a special connection was able to get the to reflash the ECU's. Once I got them back all was good.
If you look inside the motor cowling on the stbd side you should see the smartcraft 10pin plug. Make sure it is on the motor.
I can tell you what you need from there.

Yes, they are smartcraft ready. I powered them up to confirm hours (actually 26 minutes) when I first got the 32. I used the a jumper box direct to power input (main 12v connect), and the 10 pin plug to for the info. I have the 10 pin cables for rigging, just dont like the smartcraft gauges that I have.

Use the standard 8 pin harness for the key switch, kill switch and neutral safety only. You will need 2ea blue can-buss smartcraft cables with terminators built into one end. That will plug into the engine. You will need a connecting block 6 port for under the helm. That is where both motors and the vessel view will go to.

Progress report. I haven't been able to spend as much time on the 28 as I wanted, but moving along. Ive been real busy at w*rk.

Hull is pretty much stripped. Interior, Gauges, hull fittings, rub rail, and some of the old rigging is removed.

I'm ready to pull the 2.5s and it looks like they are sold on the first day listed at S&F. I'm supposed to get a deposit tomorrow.

I'm pretty firm on a paint scheme and interior. Painter is just waiting on me.

It's good to see everyone else's projects moving along. I've been checking in.

[ATTACH=CONFIG]539592[/ATTACH][ATTACH=CONFIG]539593[/ATTACH]

Does anyone know where to get the Skater alum. Rub rail? Peter says taco metals but our profile wasnt listed, and they dont sell retail. I haven't tried West Marine yet. Anyone?

FP send me a small section. I believe they are down here. I am sure I can get some either thru my company or one of our OEM customers.

Yep, Sunny Miami. Says they sell through West. Let me look around a little. Having 2 or 3 10' sticks of this rub rail shipped will be like shipping wet noodles. Guess I should plan on replacing it all.

None of these profiles exactly match mine. Let me try to get a good pic and some measurements. .

http://tacomarine.com/cat--Aluminum-...uminum_rr.html

Sold the 2.5s today. Rigged a 20' chain hoist to the beams in the shop. Worked great.

http://tacomarine.com/cat--Trim-Moulding--trim.html its on this page

FPC if mine is still good off the 308 you are welcome to it. Text me next Saturday I'll check on it while I'm up there