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It shows pretty much anything you want. However, it's not always obvious from the name the author gives some of the functions.
I've been using it for about a month. It seems accurate, but some of the data seems delayed. There is a datalogging feature, where you can tell it to log anything you want. I have it log time, RPM, Speed, Timing, Coolant temp, airflow, IAT, and GPS data.
The timing, airflow and RPM seem delayed compared to each other (i.e. RPM goes up, timing changes 1/10 of a sec after, and Airflow changes 1/10 after that.) Or maybe that's the realtime delay in the engine. I'm not sure.
One thing for sure. 87 gas pulls timing and the engine keeps trying to add, so you see 22 degrees, 44 degrees, 12 degrees, 35 degress, etc. on 93 octane, the degrees go up as the RPM goes up, steady and consistent.
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