1/8 NPT Thread. It is compatible with many of the gauges available on the market.
eBay
85mm Gauge+52mm Gauges 6 Gauge Set With Sensors 200kmh GPS Speedometer 8000rpm Tachometer Voltmeter Temp Oil Press Fuel 0-90ohm
Aliexpress UK
Size2" / 52mm. Universal for all 12V Cars. Power:DC(10-15V) 12V Professional. Using the stepping motor to improve sensitivity.
eBay
Water Temperature Sensor Adapter Pipe Gauge Radiator Hose Adapter Blue Black Temp Sensor Adapter Car Gauge Adapter for Car Boat
Aliexpress UK
This gauge is supplied in a presentation box complete with sensor & fitting instructions. This gauge is very easy to fit and suitable for novice installation. 1/8 Npt Oil pressure sensor included. This is a very impressive gauge at a great price.
eBay
0~190 Ohm Fuel Level Gauge Sensor& Water Level Gauge Sensor 150mm 200mm 250mm 300mm 400mm 500mm 600mm for Boat Car
Aliexpress UK
This is not to be confused with cheaper mass produced kits. This is only suitable for cars with a M10 x 1mm factory fitted oil pressure sensor as it mounts directly in the original location. The remote line is made using high pressure microbore hose with a reinforced stainless steel overbraid and the dual sensor connection is fabricated from solid aluminium.
eBay
Universal 4 in 1 LCD Car Gauge Water Temp+ temperature sensor Fuel Level Gauge Fuel liquid Sensor 0-190ohm 100-600mm(Optional)
Aliexpress UK
Center Tap Thread Size: 1/8" NPT Outlet Female. 1X Turbo Oil Feed Adapter Fitting. Craft: CNC Cutting. Outlet Thread Size: 1/8" BSPT Female. We believe every problem can be resolved.
eBay
0~190 Ohm Fuel Level Gauge Sensor& Water Level Gauge Sensor 150mm 200mm 250mm 300mm 400mm 500mm 600mm for Boat Car
Aliexpress UK
Suits Defi Advance, Defi Racer, Defi Din and Defi Link series gauges. This item has a PT thread like the original NOT NPT.
eBay
12V/24V LCD Digital Water Temp Gauge+10mm Temperature Sensor+Adapter Joint Pipe Sensor For Car Gauge Modification Celsius Meter
Aliexpress UK
R-Spec Subaru Impreza To 1/8 NPT Remote Dual Sensor Adaptor (Black Finish). This is not to be confused with cheaper mass produced and unverified kits. This is only suitable for the Subaru Impreza as it mounts directly in the original factory fitted sensor location.
eBay
30-0300 X-Series Wideband O2 Air Fuel Ratio Gauge Kit LSU 4.9 0258017025 Oxygen Sensor AFR Sensor Controller Gauge
Aliexpress UK
Alarm: 0.8Bar. Thread fitting: NPT1/8. Output signal: Standard resistance value: 10~184Ω.
eBay
0~190 Ohm 240~33ohm Water Level Gauge Sensor 150mm 200mm 250mm 300mm 400mm 500mm 600mm Boat Car Fuel Level Gauge Sensor custom
Aliexpress UK