Can you post exactly (steps, locations, parts list, etc) what was involved in adding the a/f gauge? I'm still having problems with my car (since Jan), have tried everything electrical and now believe it may be air leaks... current theory is a leak in the intake system causing the car to run badly (rich/lean, i dunno) and think this may help in diagnosis.
I most likely don't want permenant, so anything temp would be cool. not knowing where/if a leak is, probably closest to the spark plugs or in the wells may be the best place to look? I donno what it even reads...
Thanks,
JJ