The electrical 12v version of the 52mm turbo boost gauge measures positive boost pressure from 0 to 2 BAR. The gauge requires a 2 BAR VDO pressure sensor, part number 360-081-032-025 (see related items).
The gauge is supplied a 'U'-shaped fixing bracket and thumb nuts along with a 12v /2w illumination bulb. Night illumination is classic white.
The gauge size of 52mm denotes the outer diameter of the main body of the instrument and hence a 53mm to 54mm diameter hole is required in the dashboard.