That's right, 86s should have the tach wiring in place. You can check
easily by looking closely at the ignition coil. There will be a whitish
plastic connector plugged in to it. It should have either 1 or 2 green
wires. If it has 2, the second one is for the tach and this wire runs
forward up into the dash. The other place to check is the 14 pin
connector to the instrument cluster. If it has a green wire on pin 9
then you should be good to go.

Mark

Tim Hannink wrote:
>
> The wiring for the tach signal should already be in place. According to the
> Bentley, the general wiring diagram for '86 Vanagons is separated by VIN
> number but both have the tach wire run all ready in place between the coil
> to the instrument panel connector (T14/9).  I am adding an aftermarket tach
> to my tach-less '87 camper and just finished making all of the tach
> connections on the instrument panel without running any new wiring.
>
> I would plug in the new instrument panel and see if it works.
>
> Good luck
>
> Tim Hannink
>