3rd gen rallye dash harnesses... are they the same with/without clock/tach

[Charger1973]

My cars got a rallye dash in it, with the 120 speedo, and no clock or tach.  Id like to upgrade to a cluster with the 150 speedo and tach.  Is the harness the same?

[Nacho-RT74]

Harness difference between three ( basic, clock and tach ) are just couple of wires from engine bay  ( negative lead of coil ) inserted on bulkhead cavity and another wire to accesories source on tach one that I'm not sure if they are REALLY tapped together with rest of harness.

I think My 74 Mopar parts catalog just list ONE PN to all options underdash harness so probably they are just estra wires added on a different harness

Clock one just have a extra black wire coming from same cluster... from amm stud, so definitelly is the same underdash harness with basic one.

pay attention on this: CLUSTER HOUSING and SMALL GAUGES are different between clock/tach AND basic one...

[Nacho-RT74]

look at the location of gauges studs and the opening to clock ( or tach )