This range of Stack gauges have been specifically designed for vehicles with no or low powered electrical systems.
Stack Instruments Series, Gauge, Boost Press, Mech, 52Mm, White, -1 To +2 Bar, T-Fitting 0.187" Barb (M)
Autometer Stack 52mm -1 to +2 Bar T-Fitting 0.187in Barb (M) Mechanical Boost Pressure Gauge - White
GAUGE, BOOST PRESS, MECH, 52MM, WHITE, -1 TO +2 BAR, T-FITTING 0.187" BARB (M)
Ideal For Vehicles That Operate On Voltages Other Than 12V
Bronze Bourdon Tube 270 Degree Sweep Movement
Or Operate On A Battery With No Generator
2-1/16" BOOST-VAC,-1 - +2 BAR,MECH,STACK
w/No Voltage At All Magneto Applications
Ga Bst Mech Wht 2Bar
STACK INSTRUMENTS
Boost Gauge