Fun vs Rules - When is too much fun a bad thing?

[Dejavroom]

So in my current campaign. My players are new to Gurps as am I!

We've been having a blast already, Slaying the monsters I've created, Talking with NPCs.. You know, The usual.

But there has something that has been on my mind lately in reguards to my attitude of "Fun vs rules" For some context, I make my players track ammunition, Gear, Supplies etc.. But I've been thinking more about detailed stuff, Like First aid and medical gear. Do I may them track the individual tools? Or just give them "Charges" As a stereotypical game item?

I'm torn here, and would like to know other people's opinions. For more context, I am running my sessions as a GAME with serious roleplay elements.

I'm slightly unsure about what I want to get out of this post, But I'd like to just hear what other GMs say!

Thank you in advance.