There's nothing about the swap that should have rendered your speedo or tach dead. Now the temp gauge.......mine didn't register after the swap so I just went with a mechanical water temp gauge. On the speedo, are you positive the cable is attached in the trans and to the back of the cluster? All that is simply mechanical, meaning a cable is turned by the trans which turns the speedometer, no electrical issues should keep it from working. On the tach, are you positive you got your ignition side wiring correct? One of the wires that you wired into the TFI plug is for tach signal, should be the tan/yellow wire.