Sensor things, based loosely on Master of Orion and some of my own interpretations.
Each TL advance allowed an additional 25 Active Points. Most sensors were built on 25 points, with modifiers of 25 AP each, Active, Microscopic, Nanoscale, Molecular, Quantum, Megascale, Planetary, Orbital, System, Lightyear.
Your empire had to possess the knowledge of certain SFX types to have these sensors:
Optical, Infrared, Laser Radar, Radar, Chemical, Radiation, Warp, Seismic, Environmental, Botanical, Magnetic, Ionic, Neutrino, Biological, Psionic, Motion, Gravity, Microbial, Neural, Medical, Density, Tachyon, Particle, Flux, Genetic, Viral, Antimatter, Multiphase, Dark Matter, Dark Energy, Subspace, Quantum