AFTERMARKET TACH WIRING DIAGRAM

Wiring Harness Information - LT1 Swap
Later LT1 and on LS1, Vortec 4.8/5.3/6.0 this comes from the PCM, which generates this signal for a aftermarket tachometer. The stock LS tach signal is 4 cylinder type signal. This can be programmed as 4, 6, or 8 cylinder signal. Some 2003+ LS PCM's tach signal is not strong enough, and needs boosted, see this link.
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