Power plants increasingly seek reliable domestic alternatives for critical hydraulic measurement. The non-contact magnetostrictive level gauge for power plant hydraulic cylinders is a strong import substitute. It uses a magnetostrictive waveguide and a position magnet to produce an absolute level signal without mechanical contact between moving parts. This design resists wear, vibration, pressure fluctuations, and electromagnetic interference common in turbine control, gate actuation, and auxiliary hydraulic systems. Compared with imported gauges, the domestic substitute offers comparable accuracy, repeatability, and long-term stability while reducing lead time, spare-part cost, and maintenance risk. It supports high-pressure housings, stainless steel wetted parts, wide temperature ranges, and standard analog or digital outputs for DCS integration. Factory calibration, leak testing, and EMC verification help ensure safe commissioning. For plant operators, replacing imported units with local non-contact magnetostrictive level gauges improves supply security and lifecycle economy. Proper selection should match stroke or level range, pressure rating, fluid compatibility, output signal, and installation clearance. Routine inspection, easy zero and span adjustment, and local technical support further strengthen the business case for import replacement. With proven import substitution, power plant hydraulic cylinder level measurement can become more dependable, cost-effective, and easier to maintain.