Is the oil psi gauge manual or electrical? Along the turbo side of the engine is a row of pipe plugs. That is you main oil gallery. Most electrical sending units are in that row of plugs. Most manual lines are in the driver side rear of the cylinder block. I would get a manual gauge and test my oil psi in the main oil gallery, with a hot engine. The fuel psi gauge looks like a manual reading. The way the fuel transfer pump is made, causes the fuel psi to bounce. On top of the secondary fuel filter is the most common place fuel psi is measured. It is a oring boss thread and can strip very easily. If it does strip, I take the base off and apart. Drill hole to a 1/4 NPT. Fuel PSI at idle is 40 PSI. When you rev it up, drops down to 30 psi. The fuel transfer pump on these caused a lot of trouble at the start. You can rebuild them very cheap or buy a reman. The fuel return line is usually a number four line. I dislike the number four as it can swell up internally and restrict return fuel flow. When this happens, the fuel filter can blow off or it blows a valve out of the pump. If you replace the line to a number 6 which is larger. You have to change the fitting in the fuel pump. This system has no relief valve and builds psi by the orifice in the return fitting. Fuel psi under load needs to stay at 20 psi or higher. Turbo psi gauge will not work unless you put a load on it. Depends on HP, but around 18 psi turbo psi is normal at full load. What is our full engine serial number and I can look it up.
Is the oil psi gauge manual or electrical? Along the turbo side of the engine is a row of pipe plugs. That is you main oil gallery. Most electrical sending units are in that row of plugs. Most manual lines are in the driver side rear of the cylinder block. I would get a manual gauge and test my oil psi in the main oil gallery, with a hot engine.
The fuel psi gauge looks like a manual reading. The way the fuel transfer pump is made, causes the fuel psi to bounce. On top of the secondary fuel filter is the most common place fuel psi is measured. It is a oring boss thread and can strip very easily. If it does strip, I take the base off and apart. Drill hole to a 1/4 NPT. Fuel PSI at idle is 40 PSI. When you rev it up, drops down to 30 psi. The fuel transfer pump on these caused a lot of trouble at the start. You can rebuild them very cheap or buy a reman. The fuel return line is usually a number four line. I dislike the number four as it can swell up internally and restrict return fuel flow. When this happens, the fuel filter can blow off or it blows a valve out of the pump. If you replace the line to a number 6 which is larger. You have to change the fitting in the fuel pump. This system has no relief valve and builds psi by the orifice in the return fitting. Fuel psi under load needs to stay at 20 psi or higher.
Turbo psi gauge will not work unless you put a load on it. Depends on HP, but around 18 psi turbo psi is normal at full load. What is our full engine serial number and I can look it up.
Thanks for the info.
If ever get back to the truck , or of i buy it , I'll let you knpw the engine number
Presumably you passed that one by.