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Ignition Rev counter with Bluetooth

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Is there such a thing as a an ignition sensor/rev counter with a bluetooth output, so you can watch the Revs on a phone or computer?  Or how bout just a coil  or spark sensor with bluetooth?  Some racing loggers can display the revs if you have OBD (which a Zed doesn't have) or a bluetooth SPP adapter.


Edited by TomoHawk

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If you have OBD there are adapter that allow you to see rpm. We used one to set the idle on a 1998 GM 350

72 body and block, everything else 71, Tokico springs, Illumina, R180 CLSD, 83 close ratio, 3.90 gears, Ztherapy SUs, BRE 15X7 Libre wheels and BRE front spoiler.

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