From $1195.00 to $1499.00
Model Description Part No. Price Buy
US-8A-44-cylinder engines without a Primary CHT gauge already installed. Includes 4 EGT probes, 4 CHT probes and 8 ea 6-ft harnesses
US-8A-4G4-cylinder pkg for a/c w/ Primary CHT gauge already installed. Includes 4 EGT probes, 3 CHT probes, 1 P-102 gasket type CHT probe and 8 ea 6-ft harnesses
US-8A-66-cylinder pkg for a/c without Primary CHT guage already installed. Includes 6 EGT probes, 6 CHT probes & 12 ea 6-ft harnesses
US-8A-6G6-cylinder pkg for a/c with a Primary CHT gauge already installed. Includes 6 EGT probes, 5 CHT probes, 1 P-102 gasket type CHT probe and 12 ea 6-ft harnesses
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Simultaneously displays EGT and CHT for Singles. (For Twins, call for model designation. May require two US-8As, depending on your requirements). Automatic Diagnostic Assist helps diagnose engine problems such as fouled plugs, burned valves, intake leaks, low compression, etc.

Impressive Features Include:
    Auto Scan up to 16 temperature channels

    Re-programmable Temp Limits From the Front Panel
    (unavailable on competition’s gauges in this category)

    Auto Detection of hottest EGT and hottest CHT + pilot-programmed Over - Temp and Under-Temp limits

    Programmable Scan Rate for each channel displayed
    (rather than competition making that decision for you)
One° | STEADY Resolution | 6lbs. | Standard 2-1/4" hole (or use an EI adapter plate for 3-1/8" holes)

    Probes can be substituted / consult your sales rep prior to order
    Unit is STC'd/PMA'd. Can only be used for secondary EGT/CHT only. For primary see MVP-50
E.I. products include all documentation and certifications
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I bought this as a Christmas/Birthday present for my boyfriend. He has bought other EI gauges in the past and is quite happy with them. We both like the look of the gauges and their display layout. This engine analyzer will be going in his PA 22 floatplane this Spring. Looking forward to seeing what numbers the gauge shows us for helping us diagnose a potential issue.

April G
January 7, 2018

I bought this two years ago and its sat in its box in my hangar since. Finally got around to scheduling a shop to install it. One EGT failed on them during run-up. They had to purchase a replacement from ACS. Second EGT failed on me during the initial flight home from the shop. Purchased another one from ACS to get it back up and running. Swapping failed probes is easy with the simple, seemingly proprietary crimps they send. Meanwhile, contacted mfg. They stated they would honor an exchange if I returned faulty units to them and they failed their tests (which is just a resistance check, which I tested both and they failed). They confirmed failure and sent me two replacements, which will now sit on my shelf until two more fail. The rep I spoke to was hesitant to admit anything, esp when I queried how often a six-cyl kit ships with two defective probes. Alas, its up and running now. I have 15 hours on the kit with no more issues. Unit itself works well and has discovered a cold cylinder that we have to look at. Its also fun being able to minutely lean the engine. Mfg supplies a TON of information on engine management with the package. Both the installation manual and the glossy, professionally-made operators manual read like college texts, which is both good and bad.

January 12, 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: Can the EI US-8A be used with the Jabiru 3300 or 2200 engine?

Yes it can as it will use a clamp type EGT and 12mm CHT probes. You must put in the special instruction notes that it is for a Jabiru 3300 or 2200 or you will get the wrong probes.

Q: The description says, Can only be used for secondary EGT/CHT only. Does that mean I can't remove the factory EGT gauge if I use this engine analyzer? That's the hole I was planning to use.

That is correct. For certified aircraft, the Electronics International US-8A can only be used as a secondary gauge. If you would like to remove your original engine analyzer, you would need to replace it with a certified primary analyzer such as the EI MVP-50.

Q: In regarding primary and secondary gauges, my original EGT gauge is unserviceable, do I have to replace that gauge before I can install and use the EI US-8A or do I just have to leave the dead gauge in place and use the new gauge? Thanks. N.

Your primary EGT gauge is always required. The US-8A can only be installed as a secondary EGT. You can install and use the US-8A but it does not replace your primary EGT gauge.

Q: Hi, I never had CHT or EGT gauges in my aircraft (1957 172). Can I legally install this?

Yes, this is STCd for the Cessna 172.

Q: I have an EGT but no CHT in my PA28-180. Would I have to install a primary CHT before I could install this?

Per the product description this is for 4-cylinder engines without a Primary CHT gauge already installed.

Q: It does not appear that the US-8A comes with an Airplane Flight Manual (AFM) supplement. Is that the case?

Correct. It does not come with one.

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