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LS short box · 10-12-2023, 04:37 PM

I've always used Auto Meter tach's on my LS swaps. Yes the ECM sends the signal to the tach. On the back of the tach are dip switches that can be set for 4,6 and 8 cylinder. LS ECM's use the 4 cylinder setting.

10-12-2023, 04:37 PM	#5
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 1,951	Re: Tach wire I've always used Auto Meter tach's on my LS swaps. Yes the ECM sends the signal to the tach. On the back of the tach are dip switches that can be set for 4,6 and 8 cylinder. LS ECM's use the 4 cylinder setting.