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harlan shift light

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Old Jun 19, 2007 | 11:17 AM
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Default harlan shift light
hey isnt there a way to just hook the rpm connection on the shift light to the tach on the speedo instead of hooking it up to the pcm? or even under the dash where the ob2 port is
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Old Jun 20, 2007 | 05:17 AM
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Not that I'm aware of, just run a wire. Its not that hard, really.

Peace,
Craig.
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Old Jun 20, 2007 | 11:01 PM
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dont see any difference because its all connected to the pcm
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Old Jun 20, 2007 | 11:19 PM
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noone else
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Old Jun 20, 2007 | 11:41 PM
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Stock Tach is run via serial data messages, not from the tach output from the PCM.

Hell, the tach line doesn't even come into the cabin on the LS1 cars.
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Old Jun 21, 2007 | 01:01 AM
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ok how about the obII port?
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Old Jun 21, 2007 | 01:21 AM
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i think its pin 3 for rpm isnt it
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Old Jun 21, 2007 | 07:57 AM
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Originally Posted by SLP4CamaroSS
i think its pin 3 for rpm isnt it
no.

trust me, if it was in the car I'd tell people to connect it there.
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