how to bench test a 70 Dart instrument cluster?

Update - the new replacement gauges are considerably different that the stock ones, and are, I believe, superior in function. The issue is that the IVR for the new replacement gauges is different than the IVR made for the stock gauges and the two cannot be mixed. You have to be clear which gauges you are using when you purchase the IVR and best to buy the IVR from the company that makes them since distributors might not understand the situation.