So randomly he tail tucks. Does that mean she is scared? We'll be playing and then sometimes when I reach for her it will tuck. There are other times randomly it will happen. She does it sometimes when I put her harness on. I'm confused =/

I don't know why she would do that randomly but I thought I would share some odd behavior from our 7 year old male. He absolutely must hate the text message notification from an iphone. whenever one goes off he will just calmly get up and leave the room. It could even be if one goes off on TV he's up and out. Sometimes he goes to his places other time's wants to go outside but where ever we're at in the house if one goes off, he's leaving the room. Any other phone doesn't bother him, but iphone's... (sorry Steve Jobs..) Husky's certainly have their own personality!!

It doesn't necessarily mean scared it could be apprehensive like a "I don't know why you are reaching for me" Or "I don't like putting my harness on" Both of my dogs don't like putting harness on even though they like what we do when they have them on.
You could try counter conditioning her to you touching or even just reaching like reach out and then give a treat. Dog body langue isn't as simple as tail up happy or tail down scared. I have seen dogs have high wagging tails and then try and attack the dog next to them but if you looked at the whole body of the dog you could tell he as being a jerk.

Also do you mean tail all the way under him or just down because that is different.

It goes down, very rarely does it tuck like covering genitals. Maybe she is just focusing or maybe it's cause im huge compared to her with such a large object coming towards her she doesn't like it

Yes bandit is the same way with the harness. Her tail tucks and covers genitals. She hates putting it on but once it's on she knows it means walks or car ride