Since tachyons can't travel slower than the speed of light, it's a pretty efficient way of connecting distant parts of the galaxy.

In a gate, a tachyon coil sends energy into a ripstar and causes it to warp, and this warp releases a very large wave of tachyons that the ship then 'rides' to the next sector in the form of a wormhole. Ripstar fragments are also used in a few weapon designs. Several of the factions maintain enclaves there because the ripstars provide a useful defense, and one faction wants to gain an economic advantage by secretly developing the technology to harvest them. Ripstars in open space are a potential threat because they're only a few meters across but generate very strong gravity, and only one explored region actually has them in any abundance. Tachyon gates were built around a type of singularity called a ripstar, which is relatively rare and very dense. I used to greatly enjoy the first-person space game Tachyon: The Fringe, which had an interface similar to those used in X-Wing and related games, and had a FTL system similar in a few basic ways to the B5 system.