Hello guys, new here, and just hopingto get some help. Or at the very least get a direction to start in.

I also hope I posted this in the right place. If not can an admin move it?

Awhile back when I first got my 2002 super crew there was this odd 6" long antenna mounted on the roof. For like a cell phone? So I thought. Soooo being a genius, I cut it off right at the base.
Ever sense then my upper console compass went on the fritz. It would come and just have everything lit up, and turns off and keep doing that. Eventually that stopped and it just never came on again.

About the time I noticed my compass wasn't working I noticed map lights (switchable lights in either side of the dome light) weren't working. I couldn't turn them off. As well as my vanity lights behind my sunvisors. And then a little later I noticed my factory auto dimming mirror wasn't doing anything at all. No lights on it. Nothing. What boggles me, is all these things are supposed to be on the same circuit as the under hood light, and glove box light. Which both work fine.

Now I was thinking battery saver really... Is that a very SPECIFIC relay for that? Or can any really that fits in that spot work?

Also what about the GEM module?

The only thing that would make me lean towards that is when I was driving home today I was doing 70mph, I let off the gas and my speedometer dropped to 0, then back up to 70. I waited a second and let off the accelorator, and it did it again. Jumped from 70 to 0. Could have just been a fluke?

Is there anyone out there that had had similar issues? It has fixed a similar issue? Or has the knowledge to know what's going on? I would really appreciate it. This kind of stuff keeps me awake at night.