700r4 Lockup light

[kaycee]

So I put in a TCI lockup kit have it wired to lockup in 4th only ,red wire to brake switch and onto the switched fused panel. Was working great no problem,but the other night I dont think it was locking up ,would ride the brake and watch the tach and no difference in rpms. So I was wanting t run a light so when the lockup kicks in the light will come on or off. How do I accomplish this I have a green wire that is not in use but can be used for an optional on/off switch can the light be used instead of a switch ??