Got mine installed today. I have yet to get any usable mpg readings, but after an 8 mile trip I compared the guino and speedometer to get 9969 ticks per mile. After a 90 mile trip, I was less than .1% (yeah, 1/10th percent) off.. My VSS seems solid. My instantaneous mpg never went over 15 however, even when I decreased microsecondsPerGallon by a factor of 10.
I used a harddrive power connector to connect my car to the guino. Since we only need 4 wires, it seems to work great. An added benefit is you can use another hd power connector to power it on the bench.
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