Sounds like the dash harness has some crossed wires. Perhaps the grey rheo wire is being used as a ground by something engaged in the run position on the ignition switch.
Could also be an issue with the turnsignal switch (did you replace it during the resto of the dash area?), later NOS units have different connectors and perhaps that is messing things up.
Do you have working gauges (fuel etc- dummy lights) when the dash lights act up? How about the dome or courtesy lights?
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My Break Away Squad
1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops)
1969 LeMans (2dr & 4dr Hardtop and a Cvt)
1969 LeMans Safari 2 seat Wagon
1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop)
1969 Catalina (3 Cvt’s & a 2dr hardtop)
1969 Ventura 2 Seat Wagon
1969 Executive 4dr Sedan
1969 Bonnie Cvt
1969 Bonnie 3 Seat Wagon (2 of them)
1969 Bonnie Brougham (4dr Hardtop & Cvt)
1969 Grand Prix SJ (2 of them)
1969 2+2 2dr Hardtop (Canadian model)
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