HemiTronix

Wiring up the sensors and stuff is really pretty straightforward I think. Think of it like plumbing, "stuff" flows down the line between pieces. If you can follow lines on a piece of paper you should be able to wire up the Megasquirt. They have some pretty nice schematics and pinouts for the plugs and label stuff quite nicely (especially with a relay board), they just have one big plug that's hard to keep track of where the pins are. Putting connectors on for all the sensors could be difficult too depending on how you want to do it. The easiest way would be to cut them off a stock harness and just splice them on the ends of the Megasquirt harness and use a relay board (don't have to put wires into the large 40 pin plug this way). The better way would be to actually try to track the connectors down unassembled and manually crimp the pins on the end of the harness, but good luck finding the connectors.

I agree on the setup though. I was pretty much flying blind when I first tried to get my car to fire on the Megasquirt. There are some pretty good guides for parameter setup at least, and if you start with a simpler setup (like batch fire and only fuel, no spark), it's not too bad and there's not too much you have to setup. The tuning was also pretty challenging. The base tune is for a 350 Chevy (what the computer was originally built for), so I figured it would run okay on a 345 Hemi since they are roughly the same size...wrong. They do have a calculator though were you can put in your estimated peak horsepower, torque, and respective rpms and it will spit out a pretty decent base map. It made my car run way smoother when I started over with it.

The important thing to remember is that you don't have to try to set up everything at once for the first go. You can turn off lots of stuff like O2 correction, IAC control, etc. and just try to get the car to start and idle (crank pulse, fuel map tuning) then start adding and tuning features as you go. You can modify tons of stuff like afterstart enrichment, warmup curves (basically like a choke), accelerator enrichment, etc., but the base settings generally work pretty good for a plain jane tune. Once you get it running you can slowly tweak the settings to work better with your engine.

It's definitely not the plug and play solution that a lot of people want, but it's really one of the most poweful options out there because of what all it lets you tune. I've tried to get a thread going on the forums here with tune files for different computers for people that are interested in the swap, but somewhat hesistant because of the tuning. I know I really would have liked a known running tune to at least reference when starting, but couldn't find any. I've posted a version of my working tune for anyone that's interested over in that thread. I was hoping as more people got them running they would add to the thread.