87 wagoneer/4.0/4wd

Morning all:

I have a fuel pressure gauge from Harbor Freight. The fittings do not fit the schrader valve on the fuel rail.

Anyone know what size the fitting is and where I could pick one up?

Thanks in advance,
Jan

 

Do you have a gauge designed for fuel injection?

 

I had the wrong gauge.

Rented one from autozone and got the following,
32-34 steady
42 with vacuum line to FPR removed

What does that indicate?