Well if you have the dash out of the car . . . I would probably mount the gauges first then arrange the wiring harness, then mount the switch pod cluster, hook it all up, mount the heater control and attach all the cables, install the radio and then all the lower trim and upper light bar. I plan to build a new dash for my convertible as I currently have a standard dash but really prefer the rallye dash. I have a lot of the parts already for the job.