The safest way is to remove the gauge assembly from the dash. 4 nuts holding it on.
Then remove the individual clusters separately from the housing.
If I remember correctly the fuel and oil pressure gauges have tabs.
The temp gauge can be removed from the housing simply by removing the two screws.
To get the oil gauge out you’ll have to loosen the amp gauge from the back then once the brass square clears the housing it will come out.
pic 1 pic 2Good luck