No question that the TPS is a nice feature on a motorcycle. But not having one is not a safety violation. Most of us check our tires, because we can, with an inexpensive pencil style or digital gauge at semi regular intervals. I've visually found a nail in the tire occasionally and the vague feeling from the rear of the bike gave me notification on more than one occasion that the air pressure was reduced
Probably more important is ...Do you have tire repairing tools and ability to use them when the indicator says you don't have enough air in the tires?