96 Explorer Wire Harness Tach Wire

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Question on buying a tachometer ?
I'm using a 96 Explorer wire harness that I modified using EFI guys utube video and there is a single wire that I labeled as "tach". I called Glowshift this morning to confirm that their tack would work and they told me no that because of the multi coil set up I need to by this adaptor from Autometer, For those running Garry's Explorer harness what tach are you using and did you need to buy this $100 adaptor ???

https://www.summitracing.com/parts/atm- ... DpEALw_wcB

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Never mine the PCM puts out a traditional tachometer signal though the one wire, Thanks to EFI guy!