OVERVIEW
Kit Includes:
• Fast Response Gas Racing EGT Probes (x4)
• MPG-4C 4-Channel Digital Pyrometer Gauge
• Adjustable Compression Fittings
• Connectors
• Weld Bungs (optional)
(Recommended for fuel types: Gasoline, Natural Gas, Nitrous Oxide, & Alcohols)
EGT Probe
• Probe diameter 3/16 inch (0.187 inch) (4.75 mm)
• Exposed Tip Sensing Junction (Fast Response)
• Response time constant: 250 milliseconds
• Includes 316 SS adjustable compression fitting
• Cable is 6 feet long (2 meters) or 12 feel long (4 meters)
• Made in the USA
Digital Pyrometer
• 2-1/4" (57 mm) Round Gauge
• Recall Max temperature "Peak hold" capability
• Programmable High Temperature set-point alarm
• °F/°C selectable
DIGITAL GAUGE & PROBE MADE IN THE USA
The Exhaust Gas Temperature Sensor is specifically designed for use in racing, tuning, and testing applications. Made in the USA from superior materials. The Exposed Tip sensing junction provides immediate response to dynamic temperature changes.
IMPORTANT DISCLAIMER IF YOU ARE CONSIDERING USING THIS INSTRUMENT IN AN AIRCRAFT:
This instrument is not certified by the FAA. Fitting of this instrument to certified aircraft is subject to the rules and conditions pertaining to such in your country. Please check with your local aviation authorities if in doubt. This instrument is intended for ultralight, microlight, homebuilt and experimental aircraft. Operation of this instrument is the sole responsibility of the pilot in command (PIC) of the aircraft. This person must be proficient and carry a valid and relevant pilot’s license. This person has to make themselves familiar with the operation of this instrument and the effect of any possible failure or malfunction. Under no circumstances does The Sensor Connection or manufacturer condone usage of this instrument for IFR flights.
Options:
TECHNICAL SPECIFICATIONS
MPG-4C 4-Channel Digital Pyrometer Technical Specifications:
Input: | Type K, Type J, & Type E thermocouple (ungrounded only) |
Number of Inputs: | 4 |
Display Range: | -148 to +2192°F (-100 to +1200°C) |
Accuracy: | +/- 5° (typical) over full temperature range |
LCD Display Resolution: | 160 x 128 graphic color LCD display |
LCD Backlight: | Yes |
LCD Contrast: | User selectable |
Microprocessor Resolution: | 12-bit (over sampled successive approximation) |
Environment: | 85% Max. RH (non-condensing) |
Operating Temperature: | +14 to +140°F (-10 to +60°C) |
Front Bezel Rating: | IP51 |
Input Voltage: | 8 to 30 VDC |
Current Draw: | 73mA @ 13.8V (backlight highest setting), |
Alarm Relay Contact Rating: | Normally open, |
Enclosure: | 2-1/4” ABS, black in color, front or rear mounting |
Panel Cutout Dimensions: | Drill round 2-1/4" (57 mm) hole| |
Weight: | 170 grams |
EGT Probe Specifications:
Thermocouple type: | Type K |
Sensing Junction: | Exposed, Ungrounded |
Accuracy: | +/-0.4% of reading or about +/- 1.1°C (Special Limits of Error) |
Probe Diameter: | 3/16 inch (0.187 inch) (4.75 mm) |
Response Time: | 250 mS |
Outer Sheath Material: | Inconel, melting point 2550°F (1400°C) |
Cable: | Stainless steel overbraiding over Teflon™ insulated, stranded wires, 20 gage |
Included Compression Fitting: | 316 stainless steel, double ferrule, adjustable, 1/8 inch –27 NPT male thread |
DOCUMENTS & DOWNLOADS
VIDEOS
About - KIT-MPG-4C+EGT-EP: 4-Channel EGT Pyrometer Kit — Gas Race Series
This kit pairs four EP Series exposed-junction EGT probes with the MPG-4C 4-channel color LCD pyrometer gauge, providing a complete solution for instrumenting all four exhaust runners on a 4-cylinder engine and displaying all temperatures simultaneously on a single 2-1/4" gauge.
Configuration options at checkout include:
- Cable length per probe (6, 12, or 25 feet)
- Weld bung material (none, mild steel, or stainless steel)
- Engine type (gasoline or diesel)
The diesel option substitutes DP Series sheathed probes for the EP Series exposed probes, reflecting the different requirements of diesel exhaust environments.
What’s Included
- EGT Probes (4×)
EP Series, Type K, exposed ungrounded junction, Inconel sheath, 3/16" diameter, stainless overbraid/PTFE cable, 316 SS compression fitting - MPG-4C Gauge (1×)
4-channel color LCD pyrometer, 57mm panel mount, 8–30 VDC - Compression Fittings (4×)
316 SS double-ferrule, 1/8"-27 NPT - Weld Bungs (optional)
Mild steel or stainless - Thermocouple connectors
EP vs DP Probes: Why the Sensor Changes
EP Series (Gasoline Applications)
The EP probe uses an exposed, ungrounded thermocouple junction placed directly in the exhaust gas stream. This provides very fast response to temperature changes.
- Response Time: 250 ms (time constant)
- Direct gas exposure → rapid thermal response
- Best suited for clean combustion environments
Compatible fuels:
- Gasoline
- Natural gas
- Nitrous-assisted combustion
- Methanol / ethanol / E85
DP Series (Diesel Applications)
The DP probe encloses the junction inside the sheath to protect it from particulate contamination.
- Response Time: ~1200 ms (time constant)
- Slower but more stable
- Designed for harsh exhaust environments
Diesel exhaust can degrade exposed junctions over time due to particulate and chemical exposure.
Response Time Explained
Response time is defined as the time required for the probe to reach 63.2% of a step temperature change
Multiple time constants are required for full stabilization.
EP Probe Specifications
- Type: K thermocouple
- Temperature Range: -148 to 2372°F (-100 to 1300°C)
- Accuracy: ±0.4% of reading
- Diameter: 3/16"
- Junction: Exposed, ungrounded
- Response Time: 250 ms
- Sheath: Inconel
- Cable: Stainless overbraid, PTFE insulated, 20 AWG
- Compression Fitting: 316 SS, 1/8"-27 NPT
- Max Insertion Depth: 1.1"
Cable Length Selection
Choose based on actual routing distance—not straight-line measurement.
| Length | Typical Use |
|---|---|
| 6 ft | Short installs, engine bay mounting |
| 12 ft | Most front-engine car installations |
| 25 ft | Long runs (rear engine, marine, aircraft) |
Use only thermocouple-grade extension wire—never copper.
Probe Placement
- Install 2–4 inches from exhaust valve
- Use consistent placement across all cylinders
- Position probe near center of exhaust flow
- Avoid pipe wall contact
Consistent placement ensures accurate cylinder-to-cylinder comparison.
Thermocouple Wiring
- Type K polarity:
- Yellow = Positive (+)
- Red = Negative (–)
Incorrect polarity results in inaccurate readings.
MPG-4C Gauge Overview
- 4-channel simultaneous display
- Color LCD with 5 layouts
- Per-channel alarm setpoints
- Open-collector alarm output (0.25A)
- Independent thermocouple type per channel
- 8–30 VDC operation
Applications
- 4-cylinder gasoline race engines
- Turbocharged and naturally aspirated engines
- Nitrous applications
- Alcohol-fueled engines
- Natural gas engines
- Experimental aircraft
- Dyno and development testing
Summary
The MPG-4C Gas Race Series kit provides complete per-cylinder EGT monitoring with fast-response exposed junction probes and a multi-channel display.
- EP probes provide fast response for tuning
- DP probes provide durability for diesel
- MPG-4C displays all cylinders simultaneously
- Complete kit simplifies installation