Gem System EGT Probe #2870

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Part# 2870
MFR Model# 2870


Insight is the world's largest manufacturer of aviation temperature probes. The temperature probe measures the engine's pulse and therefore is crucial to optimum performance. Insight's probes are built and tested to the highest quality control standards to ensure long life and high performance.

The EGT probe consists of a special alloy sheath connected to a stainless steel clamp. The probe tip is installed in a small hole in the exhaust stack, secured by an adjustable clamp.

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Product good but if you remove after a time in service They sometimes fail after reinstall

Joseph L Verified Purchase


March 9, 2022

Worked. Lead same length as old one being replaced.

Chuck B Verified Purchase


February 11, 2022

Exact fit and works pefectly

Glenn R
October 19, 2020

Promptly shipped and delivered earlier than the tracking system indicated. So far, it is working just fine.

October 10, 2020

Delivered fast, worked perfect. 8130 was included.

Alan W
September 23, 2020

Very quick shipping. Only 4 days to France, however, you should include the 8130 with the shipping documents and not only inside the package because customs are charging duties if they dont find them among the documents. It is minor but just so you know. All the best !

April 27, 2020

Product is well engineered for installation. Terminals are offset and easy to attach.

Richard E
August 9, 2018

Had one EGT reading two bars lower then the others making me think that cylinder wasnt making power. Replacing the probe...fixed the problem. All Gem 602 bars are even now! Aircraft Spruce always ships my orders FAST!

February 13, 2018

Speedy service and the item works well.

Klaus S
June 16, 2017

I am very disappointed in this replacement of an earlier model. The leads are very short requiring another splice right in a very hot area on the engine. I would have gladly paid more for another 18 inches of lead.

Ed T Verified Purchase


December 4, 2021


Please note, Aircraft Spruce'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. Aircraft Spruce 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: I am replacing a JPI probe part-number M-111-G. Will GEM EGT Probe #2870 work? I'm putting it on a PA-30 Lycoming IO320 a1b engine.

Yes, the Gem EGT probe (2870) will work with your Lycoming IO320 a1b.

Q: Is the GEM system EGT probe 2870 grounded? How can it be tested?

Yes, this is a grounded probe which can be tested with an ohm meter. The resistance between the two leads should be less than 2 ohms.

Q: What size is the clamp on the 2870 probe?

Per the manufacturer, this clamp fits 1-5/16"(inch) to 2-1/4" pipe.

Q: What is the diameter of the probe?

Probe is 1/8 inch inside the clamp.

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