it's a US spec and they didn't change from 1985-1989. I accidentally a couple years back bought a CE2 cluster from a newer gti (didn't know the difference at the time) and the pins/plugs were completely different.
...and now this feels all a bit silly. Just went out and plugged it in...guess what? The tach worked... I have no idea what my husband was doing to get the tach to pin itself... maybe he was plugging it in upside down?
Now it's on to tackle hopefully the little things. Turn signal indicator switching the bulbs over and what not.
Thank you Chip for the reply the vortex hasn't even responded and I posted yesterday.