Hoosier77 Posted April 20, 2011 Report Share Posted April 20, 2011 I have been de pinning and getting my s13 harness ready for installation and i was wondering about wiring my stock 620 tach, I know which wire on the s13 harness is the tach trigger wire but im not exactly sure on the 620. Im wiring this to a 1977 620 factory tach, I have looked at the 1977 wiring diagram and from best i can tell the wire I need to splice is the red Blue wire. Can anybody confirm this? I know my tach might not be calibrated correctly and all that shit but if the needle simply moved I would be happy. Thanks Quote Link to comment
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