Is this a normally open switch? Closes when it senses oil pressure?

Opposite. It is normally closed and grounded, that's why the light is on when key on, engine off. Pressure of oil opens the circuit.

c8020 oil presure switch, will this fit a 1968 firebird with a 454 big block chevy and what is the oil presure range.

SO what is the oil pressure range? I don't see the answer or is this one for the light

What is the thread size and what is the pressure at which it opens?

Thread size Isabel 1/4 NPT and the switch pressure i don't know

It is threaded with 1/8 National Pipe Thread

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⚡ Stay ahead with precision oil pressure sensing!

LIGHTWEIGHT YET DURABLE - At just 49.9g, it offers robust performance without adding bulk.
TRUSTED AC DELCO QUALITY - Backed by a professional-grade brand known for premium aftermarket parts.
ENGINEERED FOR FLAWLESS FIT - Designed to meet or exceed OEM shape and function expectations, ensuring seamless integration.
VERSATILE SYSTEM COMPATIBILITY - Ideal for multiple vehicle systems including cooling, HVAC, ignition, and fuel management.
RELIABLE OIL PRESSURE MONITORING - Delivers consistent and accurate pressure readings to protect your engine’s health.

The ACDelco C8020 Professional Oil Pressure Switch is a premium aftermarket replacement part engineered for exact fit, reliable performance, and multi-system compatibility. Lightweight and durable, it ensures your vehicle’s oil pressure is accurately monitored, safeguarding engine health with trusted ACDelco quality.

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Manufacturer	ACDelco
Part number	19106700
Item Weight	49.9 g
Product Dimensions	9.14 x 5.59 x 4.32 cm; 49.9 g
Switch Type	1-way
Included Components	油圧スイッチ
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	9.1 x 5.6 x 4.3 cm

ACDelco C8020 Professional Oil Pressure Switch

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