I use the Mega, but my code isn't even remotely close to the Lilbb code!...
I would recommend getting a Mega screw type prototyping board from ebay ($15) which will fascilitate connections.. I did have to do a few hacks to the lilbb board, for example I use an interrupt enabled pin for the turbine RPM rather than FrequencyMeasure, which means I jumpered pin 8 (used for frequencyMeasure) to pin 2 (an interrupt capable pin) and used Pin 3 for engine RPM.
I"m waiting on some cheap CAN controllers also from Ebay so I can have a couple different units in various places in the vehicle and they can 'talk' to each other.. For example, I'll have on behind the dash that takes care of the display, etc. which gets it's data from the Lilbb... I may have another one at SOME point for injector pump control if I ever get my mitts on a H1000 Pump... I got a thermocouple driver board from Ebay, 4 channel, which I have yet to get operational, but that is something else that could be 'farmed off' to another controller and the data transferred over CAN bus