This is a mechanical oil pressure gauge.
Comes with approximately 5 feet of nylon hydraulic hose.
Manufacturer
Caebont Automotive, UK - A British instrument manufacturer that inherited the SMITH trademark.
Reference Part Number
SIB521
PG1310-00C
SMIPG1310-00C
SMITHS Mechanical Oil Pressure Gauge
Specifications
52mm/52φ
Oil pressure display 0~100 LB