I ran MS for about a year with the turbo 2.6 before I pulled the engine. As for MS-II, I'm sure nobody has as it's not available yet unless you're one of the few beta testers.

I ran MS as fuel-only, although I do have a 4 cyl EDIS module I had planned on hooking up.

For spark, there is MegaSpark, MegaEDIS, and Mega Squirt-N-Edis/Spark which combines the fuel and spark code into the same hardware.

MS-II is a step further. Faster processor, more memory, bigger maps, will do fuel, EDIS, DIS, dizzy, etc. It incorporates a lot of the code people have written to do ignition. I am planning on this to run the 3800SC motor fuel and ignition.

To hook MS to the 2.6, I added in another water temp sensor and an air temp sensor. If you're going to do ignition as well, then you can use the existing water temp sensor but should check it's temp/resistance curve to make sure it's the same that MS uses standard. (Mine was, and you can use any sensor with code changes).

You don't really need to do any harness changes. I pulled the pins for the injectors from the big, multi-pin harness connectors on the passenger side fender. The rest of the stock harness I left alone.

Building a harness for MS is pretty easy nowdays. There are folks selling harness kits that give you all the color-coded wires and connectors you need for a pretty good price. Making an MS harness is pretty easy.

The one thing you need to do for ignition on the 2.6 is figure out how to get the signal needed from the distributor. It's not quite the same as the HEI GM distributor that's pretty much mapped out. I don't think it'll be that big of a deal though once you dive into it, figure out what the ignition code needs, and how you can get it from the 2.6 distributor.

--Dan