I'm sure it changes from boat to boot with different exhaust set ups. I have used the holley o2's and also the Bosche one. You can them them for a VW, and they are like $50 each compared to over a hundred for the holley.

I do the same as above, manual tuning below 1200.

Just a suggestion, join "Holley EFI Forums" and post your problem over there. I had a problem on a Sunday morning at 10:00 out in the boat. I posted the problem to the forums from my iPhone while in the boat. Then when I got home I sent member (S2H) on the forums my datalog and global folder and he had my problem figured out and I was back to 100 percent that afternoon. S2H ( Schexnayder Racing) is really good with these systems.

yeah that guy and Danny over there are super sharp.

Yes,.....

You can use it for an emergency, but the Holley is calibrated with a resistor ....

you can cut the bosche plug off, and re pin the Holley o2 with the resister still in it.

Go on....i'm listening. lol

Do you have a link with some more info on this?

So in the top pic is the Holley plug, I chop that off. Leave the brown wire on the left, that is the resistor. Then I re pin it to the bottom after cutting off THAT plug which is the $35 one you can get on Amazon Prime. (butt connectors work too). A buddy of mine did the research on this, and I just copied it. Been doing it this way for 3 years. Good luck-

EDIT: Nevermind....I'm running the NTK sensor on my turbo E85 deal. Know of a cheap version of the NTK?

no, but you can change from NTK to Bosche in the software with one click!