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I replaced the electrolytic with a .1uF polyester film...
When generating a controlled sine wave input, mpguino VSS pulses track well between 30hz to 130hz while the LCD is removed. With the LCD plugged in, there seems to be some additional noise in the VSS.
Below 30hz, there are spurious pulses. That isn't a huge concern, since my VSS is 10hz per MPH. Above 130 hz, I start to lose pulses. So, barring other ideas, it seems the next step is to carve the TTL circuit out of my somewhat spaghetti perfboard.
75mph is 750hz... So I do need to significantly improve the situation.
Fwiw, the injector pulse figures I see while in the truck look good.
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