Good support when we called with particular questions with the initial setup. We liked the functions and the price.
P-102-3/8 CHT Probe – Piggy Back
FAA Approved Instrument
- FAA TSO’d, PMA’d
- Accurate and stable measurements.
- Robust construction.
- Perfected over decades of testing and field trials.
- Other models available, see below for more details.
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, 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.

| Model |
P-102-18 |
P-102-14 |
P-102-12 |
P-102-3/8 |
| Type | Gasket | Gasket | Gasket | Piggy Back |
| Used With | 18 mm Sparkplug | 14 mm Sparkplug | 12 mm Sparkplug | Primary CHT Probe (or Tanis Heater) |
| Max Operating Temp | 700°F | 700°F | 700°F | 700°F |
Learn More |
Learn More |
Learn More |
Learn More |
Prices
Retail Prices
Packages include:
- P-102-3/8 Piggy Back CHT Probe
- Tie Wraps 7.5″ Black HT (4)
- Fire Sleeve 5/8″
- P-102-3/8″ Important Safety Installation Information
- E.I. Wire Connections Guide
Description
Package
Retail Price
P-102-3/8 CHT Probe
-
$128

Specifications
Specifications
Type
Piggy-Back
Used With
Primary CHT Probe (or Tanis Heater)
Operating Temp Range
-80°F to 700°F Max.
Certifications
FAA, TSO’d, PMA’d
Configuration
Type K, Ungrounded
Videos
Documents
Documents & Manuals
Testimonials
Customer Testimonials
Excellent installation instructions [&] recommend[ed] by others.
- Customer
Ben C. from Alaska
- Aircraft
Piper PA-22-160
- EI Instrument
I have never had an issue with any EI products… it looks fantastic on the panel.
- Customer
Thomas A. from Oklahoma
- Aircraft
Beechcraft Bonanza E35
- EI Instrument
Great service for Electronics International. Very helpful with what it needed for my aircraft. My mechanic has installed several of these units and highly recommended this for my aircraft.
I love my new EGT. Very accurate and has ambient air temperature so I know how cold my engine is before I start it. Easy to see lighting.
- Customer
Don K. from Wisconsin
- Aircraft
Piper PA-28-150
- EI Instrument
Love my new engine monitoring system.
- Customer
Tyler P. from Alberta, Canada
- Aircraft
Cessna 185F
- EI Instrument
The OPT-1 is more readable than the factory Cessna oil pressure/temp gauges.
- Customer
Daniel N. From California
- Aircraft
Cessna 175 Skylark
- EI Instrument
Straightforward installation instructions, great wiring harness. Quick answers from Tech Support.
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
Easy installation, lightweight solution. It looks good and is easy to use. [I chose E.I. because] I needed to replace my old Hobbs meter. This provided more functionality, allowing me to remove my old digital timer, and EI programmed it to my current airframe time.
Installation went great. The Fuel Flow is dead on.
- Customer
Tyler A. from Tennessee
- Aircraft
Piper PA-32RT-300T
- EI Instrument
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.