Re: wiring for 1969 z28
Welcome to TC Victor!
What you described are the wires for either a clutch safety switch (for an original 69 manual transmission car) or a neutral safety switch (for an original automatic transmission car). They should be in a connector together, and they plug into the clutch safety switch mounted on the driver side of the pedal bracket, above the clutch pedal.
If you don't have the switch mounted, there are pics here of mine I can direct you to.
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!