I'll be captain obvious and suggest that you put bungs in both banks of the exhaust and possibly a dual channel wideband to keep an eye on both sides, and it leaves a spare bung should you want to go to EFI. I bought a set of used headers and had a local shop install the bungs. I believe Young has a thread on here on how to install them correctly.

I'm welding in 4 bungs for each bank but only going to monitor the leaner side on each engine. To many gauges to monitor as it is although this one pretty crucial I won't disagree with that. From my experience not much variation from one side to the other with consistent rpm. If I were to monitor both banks I'd probably go this route.. Although doesn't give exact afr it certainly is easy to see at any speed. A matter a fact I'm installing more red warning lights rather than monitoring gauges as much. High speed, rough seas, low windscreen = very difficult to monitor all your gauges. I see dead peeps made a good point of this.

is that a narrow band or wide band gauge?

Good catch! Narrow band 0-1v. 8000 series anyway.

Don't waste your time with a narrow band. It won't tell you anything.

i wouldn't. Isn't that pretty much used for stock vehicle apps. I don't know much about it. I just ordered my sensors and warning lights last night just for the comfort level and ease. Just low fuel pressure and high oil temps to install next to gauges.

totally agree

and this is the shorted post I have done up here haha