A look at my fuel pressure gauge in my truck. Its a Westach 30lb gauge mounted in a gauge cup hung upside down in the recess just above the transfer case shift lever in my 2007 Ram with a 5.9L Cummins. I'm running a Glacier GFS-392 fuel system with a 7 micron 1st stage filter in the stock location and a 2 micron CAT filter as the 2nd stage mounted under the intake air horn.
Normally fuel pressure is a rock solid 20 psi with a pull down to about 18 psi at full power. The gauge is fluctuating just a bit, I believe I'm needing to change the 7 micron fuel filter. If that doesn't fix it, I'm suspecting the sender or pressure regulator. I'm going to watch it and if things get any worse I'll dig into it immediately, if not I'm planning to wait until my next oil change when I'm scheduled to change all my filters.
At any rate 18 psi is ok, stock was 8 psi at idle and would be pulled down to about 4 or 5 psi at full (stock) power!
Westach makes a good gauge but it doesn't look as modern as others such as ISSPRO. The white background goes good with the stock white background gauges. Even though I plan on getting an ISSPRO to match my other gauges, I'd definitely recommend Westach for a good gauge!
![](https://s2.save4k.ru/pic/V7U_2djn8O8/mqdefault.jpg)