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**dec010974** · 01-29-2014, 06:40 AM

If I'm not mistaken, the rpm signal from the pcm is red- # 10 per lt1swap directions. In some cases for the tachometer to read your gauges properly automter sell a box to install to make the tachometer read correctly. The tachometer signal that reads from the scan gauge is correct because that info comes from the pcm itself. And that is the crankshaft sensor. Also, I read somewhere that the tuner for the pcm may need to program the something in the pcm so tachomeyer gauge can read correctly.

01-29-2014, 06:40 AM	#21
dec010974 Senior Member Join Date: Oct 2012 Location: Miami, Florida Posts: 969	Re: MORE lsx wiring questions If I'm not mistaken, the rpm signal from the pcm is red- # 10 per lt1swap directions. In some cases for the tachometer to read your gauges properly automter sell a box to install to make the tachometer read correctly. The tachometer signal that reads from the scan gauge is correct because that info comes from the pcm itself. And that is the crankshaft sensor. Also, I read somewhere that the tuner for the pcm may need to program the something in the pcm so tachomeyer gauge can read correctly.