I've got my bungs welded into my risers, now I need to mount the guage. AEM says that I can only extend thr wires 20" . What are you guys doing and how do you deal with the left and right bank, 2 guages , 1 duel guage , sample from one side ?
thanks for the input . This has become a rather deep rabbit hole.

Injected? Might want to watch a lot. Carbureted? Have someone in the boat with you calling out numbers. Set it and out it back on the shelf.

Like this

DLG-1 Dual Lambda Gauge (innovatemotorsports.com)

and

18-ft. Sensor Cable (for use with Bosch LSU 4.9 OČ Sensor) - P/N: 3889 > LM-2 Accessories & Replacement Parts > Innovate Motorsports

Monitor both banks all the time from dash mounted gauge.
You will also want a set of 90* extender to keep the sensors dry and working.