anybody using Sunpro Tachs?

It seems like Sunpro was bought out by Snap-On, but now the name has been licensed to a cheap set of Chinese made gauges.

We have a Sunpro tach at work; it's sitting on an equipment test bench. The accuracy is fairly good, though as it's not on a real engine I can't comment on how well it reacts to rapid change. I would say it's adequate, but not great. Whether to use it or not depends on the nature of your project. The weird looks of it kept it off the project cars.