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Automotive volt gauges are not six volt specific. About any aftermarket parts house will have them. The six volt reading may not fall exactly in the center of the range but still be very usable. A google search gives many possibilities.
my problem has been while they are easy to find...........they have had a voltage range of 10 to 18 or so...which does me no good since I need a range of somewhere of 5 to 8..............
I found a new-old-stock vintage gauge on e-bay that read up to 7 volts. It might have been for an old boat or maybe a car - who knows. For now I'm just hooking it up under the hood for spot checks every now and then but it could be mounted permanently if I ever wanted it in the cab.
It was cheap, under $20 including postage.
Here's one that will start at 6 volts...
http://www.ebay.com/itm/Claudes-Buggies-2-1-16-Voltmeter-Gauge-K20X-6-16-Volts-/121437867875?pt=Vintage_Car_Truck_Parts_Accessories&hash=item1c4642cf63&vxp=mtr
I would have sworn my gauge went from 6 to 18 but no, 8 to 18V. Consider going digital, seems to be several choices there. Here is one.
http://www.ebay.com/itm/2-Inch-52mm-BLACK-CAR-MOTOR-DIGITAL-BLUE-LED-VOLT-VOLTAGE-GAUGE-METER-0-15V-US-/111317454840?pt=Motors_Car_Truck_Parts_Accessories&hash=item19eb098ff8&vxp=mtr
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
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