i have an 88 ea82 dl wagon and the clock died(resister inside got hot enough to unsolder a resister inside),while i was at pull and save north the other day i found a gl model  only it was a 87 but it had a trip computer instead of a clock,are they interchangeable or do i need more components for the trip meter to work?

the entire dashboard wiring loom will be different.

Plus, you'll prob find that the 87 will light up orange, whereas your one is green.

well it will fill the hole until i can put something else in there.