Do both ends of the the tubing have ferole fittings (I don't know if I am spelling that right) or is it only a ferole fitting to the gauge. Please educate me on this.
Yes , a Ferrule is used at each and and OSH Hwe. among others carry them in little plastic bags of 4 for $1.00...... Unless you need to replace the line or seriously over tighten it , they'll last for many removals and re-installations . Same Ferrule fits both metal and plastic lines .