This is everything you need to know to use an oil pressure gauge and the basics of reading it, this video explains how which to buy, how to use, and how to read the gauge.

Amazon:

Oil pressure gauge
https://amzn.to/4828k9y

Sensor socket (usually 15/16)
https://amzn.to/3Rc6mxH

Extending ratchet
https://amzn.to/3P9ms9N

Ratchet
https://amzn.to/3PdiVHE

Extensions
https://amzn.to/3szCjp2

Sockets large kit
https://amzn.to/44pbEIU

Socket small kit
https://amzn.to/3PbAesk

Cleaning
Towels https://amzn.to/3OQN8uH
Gloves https://amzn.to/3qEWjGy
Carb. Cleaner https://amzn.to/3EcocIY