What is Reddit's opinion of TORQUE Air Line Service Kit for Air Spring Bag Suspension Fitting, 1/4 NPT Elbow Fitting, 20 Feet of Tubing, Air Inflation Schrader Valve, Union Tee (Push to Connect) Components (TR2012AS)?

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Not sure how your gauges are set up in the cab as far as including them in the lines so can't speak to that.

I'd get a kit like this https://www.amazon.com/dp/B08DK7VRM6/ref=cm_sw_r_cp_apa_glt_fabc_8QPXV3R09BGCNRMH85XN

You can just run the lines out to an easily accessible point and fill them at a gas station or from a small 12v compressor. The fitting you linked is made for permanent fixture and airing up would be difficult to control. I also don't have first hand experience with it but I've heard not to connect the two bags together with a tee. Reason being that if you take a corner and the inside bag compresses, the air just goes out to the outer bag and makes the distribution uneven.

Edit: also, depending on the compressor that went out I'd consider replacing it if the rest of the system is in good shape. I love having on board air for airing down tires, filling up toys, etc.