Oil Pressure Switches

Oil Pressure Switches

Low oil pressure switches are offered as alternatives to the" whoops its too late" pressure warning transmitters fitted as original equipment, ours provide a warning when the oil pressure drops below the desired running pressure, they can irritate by actuating a warning when the engine is ticking over but are absolutely essential for spotting signs of trouble in a competition engine.

They have a 1/8 NPTF thread so screw into matching thread on T piece and use a suitable pressure gauge adapter on the thread vacated by original transmitter. We also offer a fuel pressure warning switch for carburettor engines, an essential to warn of failing pumps, blocked lines or filters all of which can cause a weak mixture to melt pistons in seconds on a highly stressed engine. A nil pressure fuel switch may be fitted downstream of an electric fuel pump to turn pump off in the event of an accident resulting in fuel line rupture etc

T pieces and oil pressure gauge adapters.

T pieces and oil pressure gauge adapters.

All engines have a tapping on an oil gallery to take the oil pressure warning transmitter, we make a range of T pieces to screw into this tapping, T pieces have one male thread to screw into the oil gallery, a female thread to take the original transmitter and a female 1/8 NPTF tapping which allows a pressure switch or a 1/8 BSP female pressure gauge line to be attached via a MMS10-3-3 adapter.

The chart below shows tapping thread for most engines.

MakeThreadPart no.MakeThreadPart no.
Alfa-Romeo Alfasud M14x1.5 TP7 Misubishi 1/8BSPT TP8
Alfa-Romeo remainder M10x1.0 TPVW Nissan 1/8BSPT TP8
Austin / Morris 1/8NPTF TP1 Opel up to 1973 M14x1.5 TP7
BMW up to 1969 M10x1.0 TPVW Opel after 1973 1/4NPTF TP2
BMW from 1969 M12x1.5 TP6 Peugeot M14x1.5 TP7
Chevrolet 1/8NPTF TP1 Porsche M10x1.0 TPVW
Chrysler / Talbot 18NPTF TP1 Renault M14x1.5 TP7
Citroen CX M14x1.5 TP7 Rover V8 1/2UNF TP3
Citroen remainder M12x1.5 TP6 Saab 1/8NPTF TP1
Fiat M12x1.5 TP6 Skoda M10x1.0 TPVW
Ford up to 1971 1/8NPTF TP1 Subaru 1/8NPTF TP1
Ford from 1971 1/4NPTF TP2 Toyota 1/8NPTF TP1
Honda 1/8BSPT TP8 Triumph 1/8NPTF TP1
Jaguar / Daimler 1/8NPTF TP1 Vauxhall early 1/4NPTF TP2
Lada M14x1.5 TP7 Vauxhall later engines M14x1.5 TP7
Lancia M14x1.5 TP7 Volkswagen M10x1.0 TPVW
Mazda 1/8BSPT TP8 Volvo 1/8NPTF TP1

Warning lights

Warning lights

These are of little use if they are not immediately visible, ours are 29mm diameter with a choice of red, yellow, green, blue or clear lens, they have a removable diffuser under the lens which may be titled using dry print lettering. A T5.5 side contact bulb is accessed from the front and is sealed against ingress of dust, oil and water. Weight is 1.5 grams.