digital dash problem

I had the digital dash replaced on my '83 280zx two years ago when it went dark. It blinked on and off for awhile before then, similar to a loose connection or shorting out. The replacement dash went out recently along with the oil pressure guage due to a blown fuse (10amp) and repeatedly does the same after a few seconds when starting the car. Again it appears like a short but where should I start looking to avoid an expensive dash replacement : fuse block, digital unit, harness ? Any help would be appreciated . Thanks.