4WD not working

I have a 95 (1st gen tacoma) without 4wd at the time.
I've been reading some threads about the "ADD" system here.
I had already norrowed my problem down to the fromt axle not engaging at all. Checked my vacum and hoses going down to the differential and they all appeared good. I'd even thought about "bypassing" the vacum switch deal (plz bear w/ me on my termanolgy. Lol) to run constant vacum down to the actuator, or whatever it's called, that's mounted down on the differential case. I'd thought about doing that just too see if it would lock it in that way. From some of the things i've read on here tho, could a person actually rig it up and drive it that way for a lil while? Say, thru the winter? Lol
This is my 2nd 1st gen 4x4 tacoma. Mmy first was a 98 5spd with the lever control for the 4x4 and auto hubs. I remember it stopped working around the same time my wifes 984runner did the same. I don't know exactly what it was or what we had fixed. Just sent them to a shop and had'm fix it. I remember it wasn't very cheap! Lol.
Anyway, the truck i have now hasn't been working at all when i pull the lever in 4lo or 4hi. Just a clicking sound, no light, no 4wd. It's an automatic tranny and auto hubs. I'd really need 4wd this winter as the rds get bad here and i have allot of hilly/curvy country rds too drive on. I really hate too spend anymore than i have to on it, but need it fixed at the same time. Deffenitely gonna fix it myself tho. If anybody has any good ideas of a simple fix, or most importantly a cheaper fix, please fill me in!! Thanks