You have to send a MIDI CLOCK from the computer sequencer to Eclipse. Then set Eclipse to receive tempo from midi. (setup->tempo->tap source->Midiclock)
DB-90 can only receive midiclock. If you want the click for the drummer, you have to sync that metronome to computer sequencer. Maybe a better way is to output the click also from a computer sequencer.
All the Best, Daniel
ps. you should update Eclipse to the latest software version 3.51