Love the situational awareness that the CGR-30 Combo gives me. Easy to read and understand displayed information.
S-300 External Shunt
FAA Approved Accessory
- PMA’d
- 300 Amp
- 3.25″ (W) x 1.75″ (D) x 1.75″ (H)
- 11.5 Oz Unit
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Product Overview
Prices
Retail Prices
Package includes:
- S-300 Shunt
- Installation Instructions
Description
Package
Retail Price
S-300 External 300 Amp Shunt
S-300
$60

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Customer Testimonials
Always a pleasure to do business with EI. Products ship rapidly. I have been using your products for 20+ years.
Excellent customer service. Without a doubt the best aviation part I have purchased.
- Customer
Alan B. from Florida
- Aircraft
Reid and Sigrist R.S.1 Snargasher
- EI Instrument
Excellent Service, superb product.
- Customer
Steven N. from Colorado
- Aircraft
Cessna 182E Skylane
- EI Instrument
Installed digital volt/amp gauge in PA 28-181. Great unit easy to install. Much better than original.
Great… price [&] support
- Customer
Harry V.D.H. from New Zealand
- Aircraft
Piper PA-28R-200 Arrow II
- EI Instrument
Works Great! Love it!
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 have heard only great words about EI… Won’t be able to install till at least April but I know you are very helpful when it comes to questions.
- Customer
Thomas W. from Virginia
- Aircraft
Piper PA-30 Twin Comanche
- EI Instrument
Easy install and great gauges. Previous experience showed that EI’s units were… great prices and even better instruments. Being able to install the gauge as a primary instrument was a major plus.
- Customer
Logan from Montana
- Aircraft
Cessna 172B
- EI Instrument
Love my new engine monitoring system.
- Customer
Tyler P. from Alberta, Canada
- Aircraft
Cessna 185F
- EI Instrument
Good to go! Excellent instructions and easy install. Outstanding instrument!