Would any of you fine gentleman be able to help me out with some information listed above? I have the old style air gauge looking to replace it with a current model
Mine is exactly the same size as the WIKA in a lot of the posts on here. 1/8 bsp, 27mm nominal diameter. You can get a Chinese version on AliExpress for $12.
I got one and was surprised by the accuracy and quality, both good.