After a lot of reasearch and measuring I took a chance on ordering a 2 5/8 boost gauge from auto meter hoping it would fit flush in the a/c vent. Just thought I’d put it out there that this size fits perfect inside the chrome housing after you remove the vents, and the retaining U-fitting that comes with the gauge holds it in place perfectly. I imagine it would work with any other 2 5/8 size gauge.
