Re: Another neutral safety switch question
A brake light switch is not set up to handle the current from the ignition switch; just look at the difference between the wire gage of the purple and purple/white ignition wires (12 gage in and out) and the orange (14 gage) and white (20 gage) brake light wires.
I'm a little confused about the "wire in series" part of the question too. The clutch safety switch will just go in line in place of the factory neutral safety switch; it should have the 12 gage purple/white coming in from the ignition switch and the 12 gage purple from the starter coming out. It is not in series with any other switches.
A relay is needed on a TKO if you use the TKO's NSS; for what you're doing, no relay is needed if you use the right clutch switch.
You need to use either a clutch safety switch from a later car (I have no idea how they are mounted and triggered), or just use a 69 setup. If you search "clutch safety switch" here you should find pics of my OE setup, and there are threads about other guys backfitting the 69 setup to their cars.
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!