Electronics International OPT1 Oil Pressure And Oil Temperature Primary 2-1/4 TSO

The Electronics International OPT-1 is a combined oil pressure and oil temperature instrument for aircraft panels with a 2-1/4 in (57 mm) instrument cut-out. It combines a large, backlit digital display with two 90-degree graphic analogue arcs, using green, yellow and red LED indication to support rapid visual monitoring of both functions.

The front-panel toggle switch selects oil pressure or oil temperature for the digital readout, while both parameters remain visible on the analogue displays. The OPT-1 uses an external PT-100GA oil-pressure transducer and P-120 oil-temperature probe, keeping the sensing components in the engine compartment.

• Manufacturer part number: OPT-1
• Combined primary oil pressure and oil temperature indication
• 2-1/4 in (57 mm) flush-panel mounting format
• Backlit, dimmable LCD for day and night readability
• Dual 90-degree LED analogue arcs with colour-coded operating ranges
• Digital resolution: 1 PSI for oil pressure and 1°F for oil temperature
• Electrical input: 7.5 to 35 V DC
• FAA TSO’d and STC’d as a primary replacement; verify eligibility for the specific aircraft and installation against the applicable approved model list and installation instructions

The manufacturer identifies the supplied package as including the OPT-1 instrument, thermocouple extension cable, P-120 oil-temperature probe, PT-100GA pressure transducer, wiring harness, installation/operating instructions and STC documentation.

Relevant manufacturer documentation includes the OPT-1 Installation & Operating Instructions, configuration worksheet, manifold dimensions/cut-out template, and STC/Approved Model List.