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A LM-1 needs the rpm converter or a Aux Box 3 to be able to log rpm. Also, the LM-1 is now discontinued and NLA except from one or two vendors. The replacement, the LM-2 can log AFR and RPM with no additional accessories. The purpose of the LM-1 or 2 is for unlimited use for tuning and diagnostics purposes, not just at WOT but at idle and part throttle. It's not the best return on investment if you only want to perform 2-3 WOT runs, but if you're going to do this more than 2-3 times, dyno runs are going to cost you more.
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