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      04-09-2007, 01:25 PM   #11
CinciBlueBimmer
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Drives: 2018 M240i / Dinan S1
Join Date: Feb 2006
Location: Cincinnati, OH

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Found it!

I decided to scope my OBD-II connector with the hope that I'd stumble onto the RPM output, and sure enough, I hit a square wave on Pin #10!

I ran it to my data logger and bingo, a perfect readout.

Here's a picture of the pin location, FYI:
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2018 M240i xi (LCI) | Estoril Blue | Dinan Stage 1