[JLMounce]

You can technically run your constant power wire to the starter lug. That circuit doesn't carry much juice, so by connecting it to the main power wire to the starter, you do satisfy that requirement. That said, there does seem to be people that have issues with it. There's probably issues elsewhere in the system that may be contributing though.

The biggest issue with wiring these systems is grounding and wire management. There are both signal and power wires that encompass the EFI and ignition system. It's easy to develop EMI issues when you have wires carrying a lot of power in close proximity to wires carrying sensor signals.

The best thing to do is plan your wiring accordingly. The first thing to note is that in general the harness you are provided is not long enough to cleanly route wires without having them all in a single bundle. Instead buy wire in various colors as well as loom. Be prepared to extend your harness as necessary. In general you should attempt to route signal wires on one side of the engine bay and power wires on the opposite side. When a signal and a power wire cross, they should do so at as close to perpendicular as possible and they should never run parallel to each other.

GROUND THE CRAP OUT OF THE CAR. There should be several grounds in the engine bay. Battery to block, block to body, body to chassis. It is not always necessary, but it can be helpful to run a ground from the unit itself to the body as well. I would plan on doing it, there's no harm.