Mechanical gauges do not require 12V power to operate. They make direct physical contact with the item they are reading. They do this through tubing or lines, which eliminates the need for electric signals.
Ideal for vehicles that operate on voltages other than 12V, with no voltage at all (magneto applications) or operate on a battery with no generator.
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, -30Inhg To +30PSI, Incl T-Fitting
Autometer Stack 52mm -30INHG to +30 PSI (Incl T-Fitting) Mechanical Boost Pressure Gauge - White
GAUGE, BOOST PRESS, MECH, 52MM, WHITE, -30INHG TO +30PSI, INCL T-FITTING
Bronze bourdon tube 270 Degrees Sweep movement
2-1/16" BST-VAC, 30/30 PSI, MECH, STACK
Ga Bst Mech Wt 30psi
STACK INSTRUMENTS
Boost Gauge