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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Description

⚡ Stay ahead with precision pressure sensing — because your engine deserves the best!

DURABLE BRASS CONTACT - High-quality brass terminal ensures reliable conductivity and long-lasting performance under pressure.
MULTI SYSTEM INTEGRATION - Supports critical vehicle systems including cooling, ignition, lighting, and fuel management for versatile use.
SEAMLESS OEM COMPATIBILITY - Engineered to meet exact ACDelco standards for flawless fit and function, eliminating guesswork in replacements.
CERTIFIED QUALITY ASSURANCE - UL and cULus certifications guarantee safety and dependability you can trust on every drive.
COMPACT LIGHTWEIGHT DESIGN - At just 1.76 ounces and a sleek 3.6x2.2x1.7 inch profile, it fits effortlessly into tight engine compartments.

The ACDelco Professional C8020 Oil Pressure Switch is a premium aftermarket replacement designed for exact OEM fit, form, and function. Featuring a durable brass contact and compact design, it supports multiple vehicle systems with certified reliability, ensuring optimal engine performance and peace of mind for professional-grade maintenance.

Specifications

Operation Mode	automatic
Contact Type	Normally Open
Connector Type	Blade
Brand	ACDelco
Terminal	Screw
Item dimensions L x W x H	3.6 x 2.2 x 1.7 inches
Circuit Type	1-way
Actuator Type	Plunger
Contact Material	Brass
International Protection Rating	IP00
Number of Positions	1
Specification Met	UL, cULus
Controller Type	Push Button
Control Method	Touch
Connectivity Protocol	X-10
Unit Count	1.0 Count
Number of Items	1
Global Trade Identification Number	00036666064063
Manufacturer	ACDelco
UPC	036666064063
Model	Oil Pressure Switch
Item Weight	1.76 ounces
Product Dimensions	3.6 x 2.2 x 1.7 inches
Item model number	C8020
Exterior	Painted
Manufacturer Part Number	C8020
OEM Part Number	19106700

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