Anyone gone efi yet? What did you choose

. From what you've said about it not coming with an O2 sensor, I assume

It comes with broadband O2. But the sensor is proprietary integrated into the ECU, unlike earlier (Holley Commander) models which can use something like an Innovate product

The problem is this:

The only O2 monitor you have is the "dashboard" in the Holley software (if using a laptop) not the handiest thing for day to day driving

If you want to install a dedicated O2 gauge such as the Innovate product, this is where the missing wire comes in

You "have to" buy Holley's proprietary gauge which is supposed to supply "the missing wire."

I agree with Pishta, to some extent on OEM Ford, but I thought we were leaving OEM out of it.

A good source of adapted stuff is over at the IHC board, "Binder Planet" Those guys are "big" on adapting GM computers and DIY burning their own chips.