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Try probing the voltage at different points in the vss circuit. I.E., roll the car in the driveway until vss hits 5v, then park it. Then measure V at both sides of your guino's vss resistor.
If you're using 100k ohm as per the instructions, your vss input may be getting reduced too low to trigger the input. It needs to flip above+below 2.5v or whatever, for the duino to detect movement. My first run in my honda got no vss, and i had to replace the 100k with a smaller one. It's currently 3.3k, which i think is a tad too low (i meant to use 33k, but grabbed the wrong one in the dark). 1000ohms was really too low, as it interfered with the real speedo. I think 100k is fine for cars with 12v vss (keep 100k on your injector, btw), but our 5v hondas have different needs.
Any signal on your injectors? I.e., any gallons-per-hour readings?
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