I would like to make a MPGuino
 

And use it with my 1995 Ford F-150. It has the EFI 5.0 Liter 302 V8. I am decent with electronics and soldering, so is it difficult to make one of these and can I make it work with my truck?

No, it's not difficult. I built one, and loaded the software, and tested it. I haven't installed it in my car yet because I'm frankly pretty lazy. I am not a particularly gifted solderer (to put it mildly), but I didn't have any trouble building it. In fact, it was harder to put the chip in the socket than to build the device.

Installation is relatively straightforward, assuming you can figure out which wires are the VSS, which are the injector pulse, which are power and which are ground. And you know how you want to tap into them, and are comfortable running a little bit of extra wiring around in your car.

-soD

I actually have one I can't use.. New, never even had power to it. I'd give it to you for $50+ shipping, unless you're set on building one.