I agree with Watson, i'd keep the oil injection. Like he said, you will use more oil with mixing it than with injection. Just keep it maintained. I have owned seadoos on and off for 15 years and the only issue I had with injection is with my recently purchased GSX because of previous owners mixing oils. (and me being the lucky one and not draining the gunky oil and replacing the lines before they plugged up.)
Here is where I get most of my parts, depending on what model you have, they might have it for you here.
www.shopsbt.com (couldnt find the oil cable there) you might have to get it from the dealer.
Or here is the the block off kit:
http://www.shopsbt.com/sea-1992-sp/36-005.html
If you want to get it hooked up, just premix your first tank, fill your injection oil tank, change your injection lines (3/32 ID weedeater gas hose I think) and open the pump with your finger to where it would be at full throttle while it idles and watch the little lines fill with oil. If they don't, replace the pump. Also, you can pre-prime the system (at least all the way up to the pump) by unscrewing a little screw on the oil pump in the middle of it and let it bleed out. But if you premix for the first tank while the injection system is priming up, you should be ok either way.
Either way, you still need the oil tank hooked up and filled half way or so with oil because your crank needs the oil supply there to lube the RV gears, etc. So you can't totally get away from it. But if the pump has been running dry for a long time, it might be no good anymore.
So you will spend more getting the pump going right now probably, but in the long run you will spend more premixing.
:cheers: