These pics are from my 89.
Of course you should already know that there are 3 lines coming from the vacuum shift housing 1 white, 1 green, and 1 yellow.
Those 3 lines connect to steel lines on the inside of the passenger framerail and turn up to the firewall.
The can be seen under the overflow tank on the passenger side fender well and behind the round canister.
The white line t's into a check valve located on the passenger side fender.
The yellow and green line connect to a junction with an additional red and blue line that is located on the passenger side of the engine behind the oil dip stick. That is as far as I got with the pics because it is 11 degress outside and even my camera was cussing about the cold.