I have an 85. The dash lights went out. At the same time, something strange
happened to the high beam indicator. When the headlights were on low beam,
the high beam indicator came on, and it went off when I switched to high
beam. Then the turn signal indicator stopped working. All this was only on
the dash. The signals and headlights themselves continued to work.

I found the plastic shell of the dash module to be badly deteriorated.
Because of this, and that the speedo was indicating over 50% faster than
actual speed (40 mph showed almost 70 mph), I decided to get a replacement
dash unit.

I found one for an 1986 that has a tach and put it in.  The turn signal
indicator works now. The dash lights still don't work and the high beam
indicator doesn't work at all. In addition, the tach is not reading and the
over-temp warning light blinks continuously, even when the engine is stone
cold.

Any ideas? It's about the only thing driving me nuts about this van. Thanks.

--Chris