[Power Surge]

Bill, the placement is only critical for a factory HEGO with an EFI system, because it needs to know the pulse delay from the head to the sensor. For reading A/F, it does not matter where the sensor is in the exhaust, as long as there are no leaks.

Tom, the LM-1 is neat, but I have found them to be "off" in their readins from actual A/F. But if you can compare it to a known good setup, the mis-reading is linear, so if you know how much it's off (as much as .5 A/F in some cases), then you can still use it.

I like the Dynojet Wideband Commander, because it's a good price and comes with many features that cost way more on most systems.