Does this correlate? (Air/fuel/smog ?...)

[area53 at validpath.com (Jeff Toomasson)]

My second mk1 is a cobbled-together, bastardized anomoly of a mk1. The PO did 
his very best to rig up several manners of "customization". It has a 3A bottom 
w/ a mildly P&P'd solid GTi head and G-grind. Not so weird you might say, but 
then it gets a little more interesting. It has an A2 fuel injection setup minus 
knock-sensor (or even the original digital idle stabilizer) and a potentiometer 
hooked to the FPR (I think - it's the connector at the fuel distro). So, 
needless to say, it idles like shit. The PO said to use the "0" setting on the 
POT and de-tune it to pass smog (which it did 2 years ago). Took me forever 
after the smog to find the sweet spot on the full POT setting after it passed. 
Well, now I have to pass smog again and rather than bothering my old mechanic 
to detune it with his sniffer (I feel really bad bothering him for freebies, 
plus the smog tech spooked me with the "it not the same w/o the dyno" jabber). 
I've been trying to do it myself. The only "advantage" I have is that the PO 
installed an Autometer A/F gauge.

So my question to you all is: if the gauge is reading stoichiometric under the 
smog test load areas (15 mph in 3rd and 25 mph in 3rd), and assuming the cat on 
O2 sensor are good, should I assume that it'll pass the chemical portion of the 
test? As an FYI - the car failed the pre-test only for NOX (lean).

Alternatively, I really need to install the K/S setup. If anything, just to get 
a stable idle back. Will the K/S manipulation of timing add any variables to 
the emissions test I should be aware of?

Thanks! 

Jeff