I have completed the repair on the vac lines for ignition and engine control. Now I need help with vac lines for the rest of the car.
I have 2 cross-over valves on the fire wall. Both look the same, 1 vac line nipple on top of each. 2 vac line nipples on the bottom of each. They each have a wire connection on the bottom.
My question is - What vac line goes where?
Any help would be great. Thanks

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Stable:
1973 450sl
1978 red diamond ice vette
1975 steel blue convertable vette
2002 steel blue dakota quad.