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This is the one I have. I have not compared it to anything else to see how accurate it is, but has worked good so far. Xeon bulb, so daytime use is good. It has an rpm readout that is accurate when compared to my tach. It can be advanced, but does not show total advance, but hell if you can add...

The second one you listed is the one I have. I got it from Autozone, about a hundred bucks, it works awesome.