I have a nissan diesel 4 cylinder td27 engine , what i the normal oil pressure gauge reading for this engine whilst running

Nissan TD Diesel Engine Workshop Manual TD23 TD25 TD27 TD27T

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When you say it was "normal" with the engine off and the key on, do you mean normal as 40-50 psi, or normal, as 0 psi since the engine was off and there should be no oil pressure? This is important because if you are reading 40-50 psi with the engine off, it is not surprising that the gauge goes "too high" once you start the engine. If the gauge is at 40-50 psi with the engine off and the key on, then there is a problem with the gauge or the sensor. It is not an overpressure issue. As long as the engine seems to be running normally otherwise and is not clacking internally or other such things that would indicate oil pressure issues, I would feel safe using the vehicle until I could have the oil pressure circuit diagnosed and repaired.

a oil gauge reading maybe delayed until car starts and builds good oil press.Did you check for spark
was car running good before this happened? Do you have a rpm reading when cranking car?

what are the valve clearences of a td 27 diesel engine

Sounds like an electrical problem, make sure the ground leads to the engine are good and the battery terminals are clean. It might just be a bad connection in the wiring harness try jiggling the connections to see if it makes the gauges jump when it is running.

is antifreeze dirty looking and if was changed was it chemically flushed?

Wire on oil sending unit may have fallen off or sensor itself may have gone bad. Check both. If engine has no tapping noises, likely it's not a pressure problem.

yes, I would not do anything as long as you do not hear any unusual noise in the engine ,