So I'm putting boost and EGT in the A-pillar and I have low side fuel pressure and trans temp in a custom mount down in the cubby hole below the heater controls. There's room for one more gauge on that mount. What should it be and why?

(07' 5.9 48RE, pretty much stock and staying that way)

 

I would say either Rail Pressure because it is nice to see both sides of fuel delivery, or Oil pressure because the stock gauge gives you no idea of what the actual pressure is.

 

I would say rail pressure, but you are saying that you will be staying stock... this is on the 07, right?

Yeah... after sitting here and thinking about it, rail. If you start having a FP problem post LP gauge, you can tell. Oil would probably be my next choice, then rear diff, if you tow a lot...

 

I vote Rail Pressure

 

My first choice would be Rail Pressure. Let's you know if there is a problem with stuck injectors or cracked injector bodies and such.
My second choice would be oil pressure as the cluster gauge is a dummy.
mishkaya

 

Rail Pressure for sure.It is instrumental for trouble shooting should you ever have a fuel system related problem.

 

Rail Pressure also gives instantaneous indication of fuel consumption...........

 

I had a feeling rail pressure was going to get the nod. So which one? I got Auotometer Ultra Lites for the others and it doesn't look like Autometer makes a rail pressure gauge that I can find. Guess I'll have one odd non-matching gauge, just like the other truck. It's got a bunch of Autometers and an ISSPRO tach.

 

On a basically stock truck i would go Oil Psi...

 

Checkout the Pricol Optix lineup, usually called DiPricol...............

From my Liberty KJ CRD - uses the same Bosch CP3 as Cummins: