NASA has the same 2 year rule on harness so no dice.
You can however get an FIA approved harness. These are good for 5 years since that is how long the FIA approves them for. NASA honors this. They do not alot cost more, but are good for 3 more years so they are well worth it.
As for the dash are you covering where the center console used to be? I used plastic plate and use that area for switches. Stock oil pressure and aftermarket oil temp gauges are in the center speaker grate
Here is my early car interior.