New Harness Question

[troutstreamnm]

I'm rewiring my 70 Charger 500 with a set of M&H harnesses from YearOne.  I've pulled all the old wiring and matched up most of the connectors with the new M&H set with the exception of one connector that has grey/black and yellow/black wires (see pic).  This connector is not on my old harness and if I identified the other end of the grey/black lead correctly it hooks up to the coil.  The car has electronic ignition and the replacement harness I bought is the mod to electronic ignition for a 70 B-Body big block.  Can you help to what this connector should be plugging into?  Am I missing some wiring or just confused    Thanks

[nascarxx29]

looks like a tach wire.Which I recall was originally grey with a black tracer.And has a matching grey connection from the tach to the firewall grommet near the booster as seen on the firewall picture

[troutstreamnm]

That does make sense and explains why it's not on my old harness.  Now I can wire my tach into that connector and not run a separate wire.  Thanks you! 

[nascarxx29]

Anytime happy to have helped out