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Your 88 non turbo fuel, USA version should look just like the jpg attached.
The last thing that is in the fuel system on the engine is the FPR and if the pump is running fuel should pour out of the return line on its way back to the fuel tank as long as the pump is running.
IF fuel is not running out of the FPR on it's way back to the fuel tank then you have something plumbed wrong.
A RX, a stk RX starts with the fuel rail reading 37-38 psi. The 41 psi is not that different and the car should start even if it reads 41psi.
You'd read fuel RAIL pressure by tee'ing in a fuel gauge right after the fuel filter and running the pump. You should see what the FSM states...37-39psi.
I've no idea why your trying to read the fuel pressure on the return side. There should be little fuel pressure there since it's running straight back to the fuel tank.
A 88 non turbo should look like the attached jpg. If you pull the return line off and run the pump fuel should flow out the return line from the direction of the engine.
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