cam seals

so i took my car to canadina tire for oil change and got my motor washed. the leak appeared to be behind the cam coevr, so i took it off and its coming out of the left cam seal. does any body now how to fix. i have the hanse manual and i will follow it close, but any suggestions would help.just bought the car. as well the odometer and temp gague is not working

1989 7mgte
upgraded exhust 2.5
upgrade head gasket
boosted turbo 12psi