Tach fits my panel nicely, was easy to install.
P-100 – CHT Probe
FAA Approved Instrument
- FAA TSO’d, PMA’d
- Accurate and stable, precise pressure measurements.
- Can be used in a pressure environment.
- Robust construction, brass body.
- Perfected over decades of testing and field trials.
Compatible with:
MVP-50P, CGR-30, UBG-16, EAC-1, EC-1, EC-1P, EC-2, TC-1P, C-1, C-2, C-4, C-6, and CC-1P
Questions?
8am–4:30pm PST M–F
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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-2 connector. The OLC-2 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.
Prices
Retail Prices
Packages include:
- P-100 CHT Probe
- Installation Instructions
Description
Package
Retail Price
P-100 CHT Probe
-
$128
Specifications
Specifications
Common Uses
CHT Readings
Type
Screw-in
Operating Range
-80°F to 700°F Max.
FAA Certifications
TSO’d, PMA’d
Configuration
Type K, Ungrounded
Material
Brass
Videos
Documents
Documents & Manuals
Testimonials
Customer Testimonials
Installation was straightforward; great quality all around.
- Customer
Christopher L. from California
- Aircraft
C182 A
- EI Instrument
. . . more functionality, easier install, and folks at Gulfcoast said your customer service is outstanding.
- Customer
John G. from FL
- Aircraft
PA-30
- EI Instrument
The display is large and clear. The functions are simple and easy to use. Great purchase decision.
EI tech support is the best.
Great customer support. My A&P installed a CGR in a Comanche and liked it.
- Customer
Michael T. from Ohio
- Aircraft
PA28
- EI Instrument
Nice product and good product support!
- Customer
Kenneth G. from Michigan
- Aircraft
Grumman American AA-5B Tiger
- EI Instrument
Poduct was exceptionally complete, all installation materials included.
- Customer
Sakari K. from Finland
- Aircraft
Piper PA-28 Cherokee 140B
- EI Instrument
Love it!
- Customer
Corey B. From Texas
- Aircraft
Grumman American AA-5A Cheetah
- EI Instrument
I won a FP-[5]L and had it installed in my c150. I was/am impressed with the accuracy and ease of operation of the FP. I wanted a new tach and I trust (and verified) that the EI R-1… would be my best choice. I am not a rich man. These instruments are affordable and incredibly accurate. Already planning my next buy from EI.
- Customer
Charles M. from South Dakota
- Aircraft
Cessna 150F
- EI Instrument
Excellent installation instructions [&] recommend[ed] by others.
- Customer
Ben C. from Alaska
- Aircraft
Piper PA-22-160
- EI Instrument
Love the situational awareness that the CGR-30 Combo gives me. Easy to read and understand displayed information.