Calculating gauge of wire

[SMiLEYSMiLE]

Ok.
I've fitted 2 tone car horns in place of 1 tone horn on my Renault Kadjar. The factory horn is weak.
I'm attaching a photo of a waterproof scotchlok crimper connector which will connect 2 factory wires to new wires to horn. The car horn runs via 10 amp fuse.
My question is: does anybody know the gauge size of horn wiring I bought from halfords? I can't for the life of me tell which of these connectors will be correct size.
The reason for this type of connector is it seals the ends so no moisture can get to bare wire as connector will be behind grille.
Any alternative as its the only connection I can make as its limited space.

This one is particular good as it's an inline terminal connection.

Read more: Quick splice; Scotchlok? - https://www.diynot.com/diy/threads/quick-splice-scotchlok.545919/#ixzz6NjMzDL00

 

[telectrix]

solder and heatshrink sleeving is better.

 

[SMiLEYSMiLE]

solder and heatshrink sleeving is better.

I can't get soldering iron down to solder. Very tight space.

 

[telectrix]

I can't get soldering iron down to solder. Very tight space.

if you can get your fingers in for scotchlocks, you can get a solering iron in.