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, Black, -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 - Black
GAUGE, BOOST PRESS, MECH, 52MM, BLACK, -1 TO +2 BAR, T-FITTING 0.187" BARB (M)
Bronze bourdon tube 270 Degrees Sweep movement
2-1/16" BST-VAC, -1/+2 BAR, MECH, STACK
Ga Bst Mech Blk 2Bar
STACK INSTRUMENTS
Boost Gauge