Gunson Colortune

[brewsky]

Steve,
I've been tetering back and forth between the Colortune and their portable gas tester which is a little more than twice the price.
I'm always a little leary of the calibration on the A/F meters though.
I like the thought of being able to see what is happening.
Both models have been sold on ebay for less than retail in the past.

[brewsky]

Teazer,
Any luck finding the Colortune?

[gramey7]

I've had a ColorTune for years that I've used to tweak Weber carburettors. They come with standard 14mm spark plug threads.Gunnson also make 12mm adapers that screw over the 14mm threads and even come with a copper gasket. Search online, they're available from a number of places.