I looked up the diagram for your 325 and it is fuse #23,27,31,and 46 they are all located in the power distribution box in the rear left side of the engine compartment.
Also you can run a test on the cluster by doing the following,
with the key off, push and hold down the mileage reset button, with the button held down turn the ign. key one click to the acc. position, wait for about 5 secs, and it should start displaying numbers, let go , and it should run a test on all the gauges at oncepegging them all out then back to nothing.
that might help you troubleshoot whether it is a power prob. or not.
hope this helps.