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Hook it up to the first tach signal on the passenger side. If the tach only has red, green, and black wires, then you shouldnt need an adaptor. I installed Auto Meter's digital tach, installed it EXACTLY like the raptor shift light, and set the tach to 4 cyl.... for some reason, that's how it works, since it's not set up to read off a single coil -- but it works perfectly!