Steve:
I just installed an EI VA-1A volt ammeter in my 73. I put in the "external shunt" model. I have 38 amp alternators. The VA-1A required 3 shunts, 1 for the battery, and 1 for each alternator. Each of the shunts was an EI 50 amp shunt.
Hope this helps.
Mark
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Mark Hislop
N37E
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