Vibrant Performance LS engine fuel pressure adapter allows an aftermarket fuel pressure gauge to be installed on the factory fuel rail of a Chevy LS engine once the Schrader valve is removed. It has a -4 AN female flare on one end and a 1/8 in NPT female thread on the other, which also makes it useful for other gauge and sensor applications. It is machined from 6061 aluminum and finished in black anodized.
- Type: Fuel pressure gauge adapter fitting
- AN size: -4 AN female flare
- NPT size: 1/8 in female
- Material: 6061 aluminum
- Finish: Black anodized
- Application: Chevy LS factory fuel rail (remove Schrader valve)
- Part number: 16791
FAQ
What is this adapter for?
It lets an aftermarket fuel pressure gauge be plumbed into the factory fuel rail of a Chevy LS engine after the Schrader valve is removed.
What threads does it have?
It has a -4 AN female flare on one end and a 1/8 in NPT female thread on the other.
Can it be used off the LS rail?
Yes. The -4 AN to 1/8 in NPT female combination makes it useful for other gauge and sensor plumbing as well.

