SAAS SGA-320055 - Gauge Bush Brass Adaptor 

M16 x1.5 to 1/8-27 NPT

SAAS and OEM 

THREAD SIZE A M16 x 1.5

THREAD SIZE B 1/8 - 27 NPTF

Gauge Fitment (popular)

Holden Gemini, Rodeo, Jackaroo, VL Commodore

Honda All Models

Mitsubishi All Models

Nissan All Models

Subaru All Models

Toyota All Models

See SPECS for adaptor thread sizes