52mm mechanical turbo boost gauge measuring from -30inHg vacuum to +25psi positive boost pressure. The gauge is supplied with a fitting kit, including 1.8m pipe (~6ft), cable ties and T-piece.
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.
Fitting instructions here.