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IMR-Merlin's Avatar
 
Join Date: Oct 2010
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87 Tach wiring question

I am putting a tach from an 87 in my 82 930. Basically the main reason is that I am not using the factory boost gauge so I have no need for the 930 tach and have an 87 laying around.

The question that I have is which wire is the tach trigger? I have 2 wires that go to the DME, so one has to be it right?

BLK or BLK/VIO


Old 12-20-2014, 06:13 PM
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Pic is of 84, but the wires are the same color on the 87
Old 12-20-2014, 06:16 PM
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Dunno but on my 79 its black violet
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79 930: HX40S#16, MS3pro+ID1000+044+E85, Ignition: 123/TUNE/MSD6A, BB+2*turbosmart38, WMI.
Old 12-21-2014, 02:35 AM
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Thanks, I would assume it's uniform through out the years!!
Old 12-21-2014, 03:44 AM
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The skinny black violet wire is the tach trigger wire. It's in the 6 pin plug on the CD unit too.
Old 12-21-2014, 06:20 AM
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perfect, thanks gentlemen

Old 12-21-2014, 01:08 PM
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