According to the page I linked to, the exposure meter is just three LEDs in the viewfinder. I think back then they used green for correct exposure, which would be the middle LED, and the over-and-under LEDs were generally red. There is a button to check the metering, which should light up one of the LEDs. If it doesn't work, look on the bottom of the camera for a coin slotted cover which should have the battery.
I should have mentioned, to check for light leaks, take an exposure with the lens cap on and the viewfinder covered, using a fairly long shutter opening in a well lit room or outside. If the developed frame is an even black (or really dark), the camera is OK for leaks. If there are bright areas around the edges, or the whole thing is light, You've got leaks.