Part# 10-01378
MFR Model# VA-1A-50-WS


These Digital/Graphic Instruments are solid state and hold their accuracy over time and a range of environmental conditions. The colorful Graphic Analog display emits green, yellow, or red light enabling the pilot to spot problems immediately without interpreting a needle. The Digital display constantly provides an exact indication of each instrument function. Gauges mount in 2-1/4" instrument holes. These instruments (except fuel level) are STCd & TSOd for certificated aircraft.


The VA-1A is a FAA/PMA approved instrument which features a discharge warning light to act as an early warning device alerting you as soon as discharging begins. This is critical in giving the pilot as much time as possible to reduce electrical load and extend the life of the battery in flight. Also, by monitoring load currents to .1 amps the pilot can check important aircraft functions such as retracts, boost pumps, transmitter power, pilot heat, navigation lights, transponder, strobes, and any other electrical equipment. The VA-1 can replace your existing amp gauge. It is backlit for night operation and operates on 12 or 24 volt systems. Available with internal or external shunt. Wt. 9 Oz.

E.I. products include all documentation.

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Very good installation instructions.

Tom W
May 20, 2021

Great unit

Ronald S
December 21, 2019

I switched out the old ammeter on my Cherokee 140 which gave an indication of amps only. It is very nice knowing how much charge your battery holds as well. On a recent flight, my alternator failed and the yellow discharge light came on. I was able to land safely before all electrical components failed because of a dead battery. Well worth it.

Tim B
February 25, 2016

Worked well right from the start. Easy to see and the warning light gives a good indication of battery discharge. Installation was simple according to the avionics tech.

Edward S
June 4, 2015

Good product. Very accurate as I cross referenced it to a Fluke. The reason Im giving it 4 stars we had one failed that was two years old 100 hours of flying. The Voltage went totally out of whack but the amperage still worked Sent it in to EI and got it fixed for almost the same price as a new one. After talking to EI they refunded the amount to half of a new one.

Jared C
April 29, 2022

Does not fit stock cessna 172 unless you drill 4 mounting holes for the 2&1/4 inch circle stock cessna ammeter uses a spring click to hold it in place

Mike B
April 27, 2017


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: How do I know which one I need (external or internal shunts)? I have a 28V system on my B55 Baron. Can you recommend one of the EI VA1A models?

EI makes both versions as some aircraft have an external or internal shunts for there volt/ammeter. You will have to check your aircraft as neither we nor EI know exactly what your aircraft shunt set-up is. You will have to check with your A&P or check to see if behind the panel you have a shunt before the wires go to the gauge (external) or if the wires for volt/ammeter go direct to the gauge (internal).

Q: I have a 125amp shunt on the aircraft. can I use that with this EI VA-1A volts / amp indicator?

EI offers this unit in a 300 amp shunt, PN 10-01394.

Q: Bought a VA1A with 50 amp shunt. Will this work ok with my 70amp Alternator?

Yes, this is good for up to 100 amp.

Q: Bought a VA1A with 50 amp shunt. Will this work ok with my 70amp Alternator?

Per the manufacturer, the S-50 is actually a 100amp shunt and will work fine with a 70 amp alternator. They calibrate all of their volt/amp instruments at 50mV (and the S-50 is calibrated at 50amp.)

Q: What size are the studs on the back of the internal shunt model?

The studs are 0.240 inches wide. The total available thread is 0.287 inches

Q: What are the dimensions of the mounting flange?

The dimensions are 2.5" X 2.5" but the mounting holes are 1.849 inches apart.

Q: What are the dimensions of this EI VA-1A unit?

Instrument: 2.50 x 2.50 x 3.65 Deep, 2-1/4 Flush Mount

Q: Does the EI VA-1A includes all documentation? Does it also include the FAA Form 8130?

This item is marked STCd and FAA-PMA approved. There is no 8130 form in the box. Export 8130-3 form can be furnished if requested at time of order. Additional fees will apply.

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