On my 68 L30/M20 the black/white ammeter guage wire is spliced into an orange fusible link which in turn is spliced into a 10 guage red wire that is part of the front lighting harness located by the horn relay. As for the glove box light, it becomes part of the underdash harness by the heater control. My car has both the deluxe interior and the auxiliary lighting group options, both of which the glove box light was included. I believe the dealers also installed the glove box light, maybe thats how they wired it by going directly to the fuse box. Hope this helps, RonM.