The worst you're going to do is fry the $20 Speed Density computer. I would run it with the SD processor, see if you can tune it with fuel pressure. If you can't, you can always use the MAF processor. Just make sure the MAF sensor is NOT hooked up when you have the SD computer in there. I would hate to see something short and fry that sensor. As long as their is no ground on the extra wiring, there should be no current that flows through it.
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