Cessna 210 Centurion / Turbo Centurion 210C; 210D
Flight Crew Instrument; Flight Crew Private
Time Pressure
Aircraft Equipment Problem Critical
Flight Crew Diverted; Flight Crew Landed in Emergency Condition
Aircraft
Loss of engine power as well as all non-electric gauges/instruments. [Advised ATC]. Established best glide while turning back towards airport. Decided that gliding to ZZZ airport was not going to be possible so I selected a suitable field and prepared to land there. Landing was rough but uneventful and no passengers or crew were injured. Emergency services were notified.
C210 pilot reported a loss of engine power led to an off-field landing.