how to change keyswitch

ok, i have a new key cylinder, but i do not have a new electronic switch part. so i can't unplug the old one and try the new one. here is a link to the post that made me think that my switch is bad:

http://www.forabodiesonly.com/mopar/showthread.php?t=39026

if you have any other ideas about the problem, i would like to know

Thanks,

STeve

edit:
I also have a '68 Barracuda at my parents, the switch is in the dash, not the steering column. Could i pull that one out and try it in the dart? Does anyone know if they have the same wiring harness to connect them?