So the standard lambda isn't wideband then? I always thought it was? Anyone confirm this for definite?
I have a narrow band AFR gauge knocking about from an old 'project', may as well bung it in the R if the standard lambda is narrow band.
Ok you're not going to be able to take an accurate reading, but I wouldn't say it's totally pointless, nice to be able to keep an eye on things to make sure the mixture isn't leaning out drastically at the top end. Besides, if you're talking about useless gauges, then the OE oil pressure gauge is the one to slate by the sounds of things.
The way I fitted it in my old car, was obviously it needs 12V on it, (2 wires) then it has one signal wire that basically reads 0-1V coming from the sensor, I'd personally tap into the sensor side of the wiring rather than the loom side. Of the 3 wires on the lambda sensor itself, 2 will be for pre-heating it, and one will be a signal wire.