The fuse panel on a 1990 Ford Tempo is located under the dash to the left of the steering column.
A diagram for a ford tempo made in 1990 can be found online. It is a coupe model car.
From my research, as an owner of a 1990 Ford Tempo GL, there is no timing belt.
Between the engine and the transmission.
Same place you check it.
on the intake
it should have a timing chain