I just installed a product from NAPA Auto Parts on my LNC2. They screw on the tire air stems and indicate green until pressure is about 4 psi below their rating (mine are 50 psi). I was never able to judge when the tires were a "little" low. If I didn't top them fairly frequently, I'd pinch a tube and have to do a repair. The caps extend too far for use on the nose wheel, but the mains are the problem, not the nose wheel. The product is "CAP Alert". They come in a pack of four and are not expensive.

Bill Kennedy
N42BK