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

Add to Wishlist
Part# 10-25205
MFR Model# OPT-1


These Digital/Graphic Instruments are solid state and hold their accuracy over time and a range of environmental conditions. The colorful Graphic Analog display emits green, yellow, or red light enabling the pilot to spot problems immediately without interpreting a needle. The Digital display constantly provides an exact indication of each instrument function. Gauges mount in 2-1/4" instrument holes. These instruments (except fuel level) are STCd & TSOd for certificated aircraft.

OPT-1 Oil Temperature/Pressure

The OPT-1 is a dual instrument which features dual 90 degree graphic analog displays. Select to view pressure or temperature on the digital display using the toggle switch on the front panel. OTP-1 measure to 1 PSI and oil temperature to 1F on the digital display. It incorporates an external pressure transducer and temperature probe that are mounted in the engine compartment. The instrument is backlit for night operation and operates on 12 or 24V system. Oil pressure range is 25-100 PSI and oil temp. range is 65-240F. Wt. 22 oz.

E.I. products include all documentation and certifications

California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -

  • Accessories
  • Frequently Purchased With
  • Customers Also Viewed
  • Related Items


I purchased the unit from Spruce in 2013 with zero issues on my float plane. Surviving winters -50 there has been zero issues.

Jared C
May 8, 2021

Installed this unit onto my Cessna 150 with a Lycoming O-320 conversion. No issues with oil pressure or temperature readings. Very happy with the unit.

Edward S
December 28, 2018

3 aircraft on our field have the OPT-1 oil pressure/oil temp dual gauge. All 3 have had oil pressure sensor problems . Mine had 750 lbs oil pressure? Would NOT recommend this to anyone. Just over a year old and zero help from electronics international. If you buy this don’t get rid of the original gauge just put a tee in for the oil pressure sensor.

Larry G
March 19, 2018


Please note,'s personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: What is the part number for a new pressure sender for the OPT-1 EI gauge?

Part number 10-01202 is the replacement pressure sender.

Q: what comes with the OPT-1? Is this only the head unit? Does it also include all the wires and the transducer?

Per Electronics International, the OPT-1 comes with the unit, all the wires, transducer and temperature probes needed for installation.

Q: Just to be clear, does the OPT-1 come with both the temperature AND Pressure sensor? I understand that the transducer and wiring harness is standard?

Per Electronics International, the OPT-1 comes with the unit, all the wires, transducer and temperature probe needed for installation. The harness is a standard 6' to probes 3' to power.

Q: What is the part number for a new oil temp probe?


Q: Are the mounting screws and nuts included with the gauge?

Yes, this will come with all hardware needed for installation.

Q: 10-25205 Are the oil temperature probe, the pressure sender and the wires included with the gauge?

Yes, The probes are included with this gauge.

Q: Can the OPT1 oil temp be displayed in Degrees Celsius?

Per the manufacturer, this can be done but must be requested at time of order.

Q: My OPT-1 is showing zero pressure, I probably need a new transducer. Do you have a part number?

Per the installation manual you can use part # 10-01202.

Q: I would like to install the OPT-1 in a pusher so I need 12 of wire to the sensors and the standard 3 for power. How do I order the unit with longer sensor wires?

When placing the order, please indicate the length of the leads you require in the special instructions box, that will be noted on the order. We will then provide a special order for you.

Q: Is this EI OPT 1 a primary instrument for certified planes?

Yes, this is FAA Approved for certified aircraft as a primary.