Argentine here! Some of my favourites:

" Para andar a los pedos más vale cagarse "

Roughly translates to: “better shit yourself instead of going farting around” Worth noting: “andar a los pedos” also means being in a hurry.

" A caballo regalado no se le mira los dientes "

Roughly translates to: “Don’t look at the teeth of a gifted horse”, meaning you don’t look for defects in things that have been handed to you.

" Siempre hay un roto para un descosido "

I think the English equivalent is “there’s a lid for every pot”.

" Lo atamos con alambre "

Translates to: “tie it down with wire”. Usually refers to get something going even if it’s barebones or a shaky fix.

I’ll be thinking of more and maybe drop another comment later.