I would try something along the lines of what has been said; Take off the manifold and tap each manifold runner and then use standard pipe and fitting from a plumbing or hose/fitting shop and bridge them. Have an output to the transmission line somewhere on that bridge tube. Easy and should be less then $20 in parts. Be sure to have the manifold cleaned out very well after the tapping, you don't want any metal flakes from the manifold going into the engine.