I don't know which one to get. I couldn't find any info on summit about the second gauge. It seems more like it's there to make the tester look all fancy. Reminds me of the A/F guage that goes from lean to rich that's pretty much useless.
Which one works better?
Follow Ups
What's the second gauge for on this leak down tester? - Worm Boy02:00:36 03/09/07