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Old 12-01-2018, 02:31 PM   #1
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Engine RPM signal

What is the easiest way to tap into engine rpm signal? I am assuming wire tap / crimp type hardware is acceptable.

I am trying to avoid removal of the cluster or would like to make a signal tap connection while the cluster is out so that it does have to come apart again
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Old 12-01-2018, 05:57 PM   #2
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...okay perhaps there no other way other than to get to the tach signal wire.....is there a good source of information that will confirm which one it is in the cluster harnesses?

PIN number, wire colour, and harness kinda thing.........for 2000.

Wiring diagrams here I come.
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Old 12-01-2018, 11:13 PM   #3
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There is a wire on the ODBII plug that is connected to tach signal. I'll look tomorrow to see which one. I had a wire connected to my Traqmate Datalogger at one time.
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Old 12-01-2018, 11:35 PM   #4
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Yes that is true.....pretty sure I have seen OBD II shift lights.

I think that this would be the cleanest solution provided provided the proper wire tap hardware is used.....and the OBD wire isn’t screwed up.

Thanks.....Bentley EWDs were not helpful. Then again I am not an Electrical wizard either
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Old 12-02-2018, 05:04 AM   #5
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Pin#9 on the OBD port. Violet/Green Wire, on my car which is a 2003.
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Old 12-02-2018, 12:32 PM   #6
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Thank you sir.....I will try and verify if the wire colours are the same for a 2000.

My guess is that CAN bus arrangements will have changed it
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Old 12-02-2018, 01:26 PM   #7
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there is a schematic for a 7.2 2001 996 on the pelican engine swap page. shows the same as jsceash states - 'tn-signal'. there is also an engine speed signal you can grab, but looks to be a shielded wire so more problematic to tap.
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Old 12-02-2018, 08:36 PM   #8
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thanks man I will look that up...!
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