Everything under the hood is sold in reproduction, and the reproduction ones are very good. The under dash harness is peculiar only to the '69/'70, and then a different harness is required for tach or no-tach, so there doesn't seem to be a big enough market for reproduction. You'll have to repair what you've got (what I did on my '69 sportsroof), or find a decent used one.
The printed circuited board for the dash is available from NPD for $84 (ordered mine yesterday).
I knew I had never seen the entire package like the ones available for the earlier cars. I was hoping that maybe someone had started producing them since the last time that I checked. I have seen the printed circuits in the NPD catalog. I really need an under dash harness for a tach car. I am converting over to a tach dash. I know it can be wired on a standard harness but I had rather have the correct harness. Thanks.