Instructions could be MUCH more detailed. The instructions on the outside of the box are much more detailed. DO NOT lose the box. It takes a little while to figure out the buttons, but they make sense. Being able to see RPM while changing static and "full" timings is a very nice feature. Plug in the tool before you start the car. Make sure all cables are a safe distance from moving parts. I used zip ties to avoid the fan and air conditioning compressor. The green speedo/coil wire has to go through the engine on my car so I was careful. There are YouTube videos to help you understand the tool.
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