Originally Posted by richm
it's useful as long as you appreciate the limitations, and like chip says having the "rich" light on won't mean it's neccesarily rich enough. But you can tell if something is badly amiss as I said yesterday - MAP sense pipe coming off the fuel pressure regulator for example will show lean on boost no problem
I built my display myself, with scale modifications to suit what I want so I know how the LED characteristic relates to the sensor, which does make it a bit better, but on a commercial unit you've got little way of knowing much more than "lean" or "rich"
To be honest though RichM, even in the map sense pipe coming off situation is it REALLY useful? Cause personally i would notice that something was wrong just from how the car drove in that situation, unless possibly you were cruising at about 2 psi or something, so really i think its a dangerous thing to have generally as it gives you a false degree of security "oh the gauge says rich so im safe" when in fact you arent.