I have a 150 Merc too, I just put Vessel View Mobile on my phone, and put a phone mount next to the Simrad Cruise 7 on our 23' Sceptre. The top left gauge is a dual USB port, with voltmeter in the cap. The one below it is an analog fuel gauge (cover is on in the pic). Vessel View Mobile is real simple, you can customize the display to show the stuff you want. Works for us.
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1977 23' Sceptre
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