Yes, that is a good place for an oil pressure guage. Try to keep the tube away from exhaust heat.
The plug or sensor above the oil filter on a 1996 Cherokee is the oil pressure sending unit. This sensor controls the oil pressure gauge.
Right above the oil filter.
The pressure gauge will generally read 10 PSI higher than when the filter was clean. In any case do not let the filter gauge go above 40PSI.
With the aid of adapters, you can "T" into the fuel line at the fuel filter and attach a fuel pressure gauge.
I would say that the fuel filter is probley stoped up. If fuel filter is not restricked, Then check fuel pressure with a fuel pressure gauge.
You may need a new pressure gauge. They are inexpensive and can be found at any place that sells pool products. OR That may be all that you are going to get out of the system you have.
There is a 1/8"NPT tapped hole at the rear rail behind the intake manifold. There is a 1/4"NPT tapped hole just above the oil filter.
how to install the oil pressure gauge on a Chevy 350 small block
Need to check the fuel pressure with a gauge. May need a fuel filter too.
Sand filters usually have a pressure gauge in front of them indicating the back pressure before the filter.When the filter needs to be cleaned this pressure gets high. usually it has a red section on the gauge. When it hits the red it is time to think about back washing. If the gauge does not work as so often happens with these things. you can usually judge it from the lack of suction coming from the filter. After backwash you will note the pressure will be down and the suction will be up.
To find gauge pressure in a closed container, subtract the atmospheric pressure from the total pressure inside the container. Gauge pressure is the pressure above atmospheric pressure.
1999 Chevy table oil pressure gauge low and check gauges flickering