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Dual volt gauge- 2019 23 swingback. I added 2nd battery for stereo

My Simrad tells me the volts, although I have to turn the main switch to 1 or 2 to get each separately.
 
My Mercury digital gauges tell me the voltage. Like Laurence, I have to turn switch to 1 or 2 to isolate which battery it is reading. I also bought this device last year. It’s awesome. It is on sale a fair amount of the time, and that’s the time to buy it. It’s over 30% right now. Can be used on all your batteries to read overall health, and details. It’s great!

TopDon Battery Tester
 
Crowbar said:
Has anyone added volt gauges for a dual battery setup? Wondering, best spot to install, what gauge is best & wireing?
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I had a Victron BMV-602 that I installed. Might be a little more involved than most people are looking for,but for my application and 4 batteries, it worked amazing.
 
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