Very happy with our new tachometer!
C-1P Single CHT Primary Instrument
FAA Approved Instrument
- FAA, TSO’d, STC’d as a Primary Replacement.
- Upgrade your aircraft panel with the most precise CHT Primary Instrument.
Don’t Need Your Glasses To Read
- Large digital backlit display.
Interpret Your Readings Faster
- The one-degree digital display allows for quick trend analysis.
Budget Friendly
- Same precision found in the most advanced analyzers on the market, but won’t break the bank.
Accurate, Dependable & Easy To Use
- C-1P fits into your existing 2 1/4″ hole.
- LCD sunlight viewable and backlit for night operation.
- Electronics International consistently has been a leader in digital engine instrumentation since 1979.
Questions?
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Product Overview
Reliable Probes
An Engine Monitor is only as good as its probes. That’s why Electronics International (EI) has taken the development of its probes, connectors, and accessories very seriously. EI has been designing and manufacturing probes for over 30 years. All of our probes have been designed in-house by our engineering team. Our team has studied, tested and designed temperature probes since the 1970′s. They have written research documents such as The Pilots Manual – Leaning and Diagnosing Engine Problems and Accurate CHT Measurements.
Just as an Engine Monitor is only as good as its probes, a probe is only as good as its connector. That’s why EI’s engineering team developed EI’s proprietary OLC-1 connector. The OLC-1 connector greatly increases reliability and reduces installation errors as compared to traditional type connectors. Whether you’re looking for a reliable and accurate CHT, EGT, TIT or various other probe types, EI has what you need. With more than a half million probes sold and tested you can count on EI’s reliability.
The C-1P kit includes one (1) P-100 CHT Probe.

Prices
C-1P Retail Prices
Included in the package:
- C-1P Single CHT Primary Instrument
- P-100 CHT Probe
- 8’ Thermocouple Extension Cable
- Overlap Connectors
- Wire Harness
- Installation/Operating Instructions
- STC
Note: The order MUST specify Over-Temp Limit.
Description
Package
Retail Price
C-1P Single CHT Primary Instrument Package
C-1P
$492
Lead Time: Usually ships within 2–3 business days.

Specifications
Specifications
Dimensions
2.50″ x 2.50″ x 3.65″ Deep, 2 1/4″ Flush Mount
Weight
7 oz (C-1P Single CHT Primary Instrument Only)
Power Requirements
7.5 to 35 Volts, Typical: 0.1 amps @ 12 Volts
Display
Viewable in direct and indirect sunlight.
Backlight
Fully backlit and dimmable for night flights.
Certifications
FAA TSO’d, STC’d

Videos
Documents
Documents & Manuals
Testimonials
Customer Testimonials
We love our MVP-50P w/ its crisp, intuitive display and ease of operation.
Big improvement over old cluster (gauges). Good customer service.
- Customer
William P. from Louisiana
- Aircraft
Cessna U206
- EI Instrument
I have seen your products in other aircraft and have seen their reliability.
- Customer
Juan P. from British Columbia, Canada
- Aircraft
Cessna 172M Skyhawk
- EI Instrument
Much better quality with the bezel and buttons and knobs [vs. competition]. Also much easier to navigate and add fuel.
- Customer
Justin R. from Texas
- Aircraft
Cessna T207A Turbo Skywagon
- EI Instrument
My mechanic said that your product was very good, and he was correct.
Easiest company to deal with and an awesome product! Price, Certified for Primary, and Features.
- Customer
Justin E. from California
- Aircraft
Piper PA-30 Twin Comanche
- EI Instrument
Always built well. Always dependable. Been using & relying on EI equip for over 35 years!
Sales reps have been very friendly and helpful.
Incredible customer service.
Always very friendly and knowledgeable staff. Over time, I have purchased six different EI instruments for the two planes I own. The instruments are easy to install, very accurate, and dependable. EI has very stable and easy-to-operate instruments.
The installation was straightforward and quite easy. Reliability and accuracy far exceed the original [aircraft’s] oil pressure/temperature systems. Also, the price was about a third of the cost to replace the gauge cluster.
- Customer
Casey R. from Oklahoma
- Aircraft
Cessna 172M
- EI Instrument