It sounds like your original cluster had an amp gauge in the cluster and your putting in a volt meter. When you try to start the van, its pulling power thru the volt gauge(which it isnt designed to handle) cause it to flicker. But when you connect them together you have the power and continuity needed.
This is what i would do.
Connect the wires together and leave them together. Wire a positive wire from the wires you connected to the positive side of volt gauge then make your own ground wire to chassis ground from volt gauge. Then all should work as you planned.
This is what i would do.
Connect the wires together and leave them together. Wire a positive wire from the wires you connected to the positive side of volt gauge then make your own ground wire to chassis ground from volt gauge. Then all should work as you planned.
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