Thanks biggie for posting the pic for me...I finally figured it out...
Each needle reports the temp of its exhaust gas for its own cylinder.
If all cylinders are running equally hot, the needles all rise together
and point at 1375 degrees...
If they are lean, they go higher, and if they are rich, they go cold
Problem with the pc3r is that it does not support cylinder trim, one
setting changes all injectors...you can use resistors to adjust each one,
but I'm looking for a box that supports trim.
If anyone knows, let me know...I have emailed yosh with no response.