I' ll add my share.
The usual cause of low oil pressure, high oil temperature is a low quantity of oil.
If everything is normal early into the flight and that you get such indications later into the flight, it usually (in more than 80% of cases) means that there is an oil leak somewhere in your system.
Oil has a heat-absorbing effect but before anything its purpose is to avoid excessive friction between moving and/or fixed parts.
Less oil means more friction and more friction means more heat.
It is rare for 2 gauges to give erroneous readings at the same time, so take such readings very seriously, lower RPM but maintain a good airspeed to maintain air cooling. Go to the closest suitable airport and if you start losing on engine RPM, start getting vibrations or have any other reasons to believe that you may not make it to an airfield, go for the safe off-field precaution landing while you still have options and power to control.
In the rare cases that low oil is not the cause of your high temperature, very high oil temperatures (whatever their cause) can make oil evaporate and lower the oil pressure reading.
Until the oil starts evaporating, the oil volume will increase and so will your oil pressure.