Quote Originally Posted by Dgc333 View Post
FWIW, Engine Masters did a comparison of A/F gauges from the cheapest they could find to the most expensive and they all read the same.
Yeah, I'm familiar with the findings of the gauge comparison , which is why I bought a cheap gauge (NOS kit was only $200 with a Bosch 4.9 sensor). They didn't mention the NOS specifically and it just isn't working well.