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Just got an nGauge, what do all these different PID signals mean?

tevaburns

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I've been trying to a list on our wonderful forum explaining all the PID signals you can view as gauges in the nGauge device. I feel like that's a GREAT thing to stick on this section.

From looking around the forum I've found:

LAMBDA1 (& LAMBDA2 is the other side's front O2): are a different way of telling you Air-fuel ratios. You want it close to 1.00. Above 1.00 is lean, below 1.00 is rich. It's normal to go rich on load and lean on lift.

but I'm lost on many
OAPCT: something about octane, not sure. What does it mean to read -100?
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