the iron transport pipe appears to be broken. i cant get it to pick a an output. all possibilities are imputs

did you try clicking on what you want the output to be with a (BC) wrench?

the wrench has also been an option for ages, seems the redstone signal way wasn't ported yet

No i didnt try that, the last version i used you just used a Redstone signal. I like the wrench idea more. I just tried that and it worked

This is one of the rare cases that I intentionally didn't port - we have gates for automated rotation, (admittedly which are no longer in transport), and I found it irritating to need to be careful of redstone only for iron pipes.

You could have a pluggable that you could put on the side of pipes (made from redstone) that explicitly checks the side its on for redstone signal, and then does

As in iron pipe with redstone on its right side doesn't change state ever from redstone, put the "redstone input" pluggable on the right side, and then the iron pipe will change state when the redstone signal on the right side is powered (but no other sides). This would give you insane control on what can and cannot power/change a given pipe

I very much would like this feature to be added into v1.12.2! I built a new modpack on v1.12.2 and have always known iron pipes to react to redstone signal, but now since they are not I'm stuck trying to find a different solution. If anyone has a workaround or other solution please let me know!

Please consider porting the select feature to 1.12.2 please. Is there a way we can get a petition started so that you can see how important this is to people? How can we get this discussion started?

Thanks for your time, B

You can use a gate to control it instead - for example if you craft an iron AND gate, then place it on an iron pipe, then drag one of the gate actions from the right-hand side to one of the slots, like this:

Hey, thanks for your reply! I just figured out the using the OR gate for this. I've done some binary algebra when I was younger so this is somewhat familiar. I appreciate it and will likely end up using this as my solution.
On an different note, is there any way to connect a pipe wire or an OR gate on a pipe to an insulated cable from ProjectRed, or any other cable type mod? I know this is off topic, and you can ignore me if you find this is too irrelevant for the original issue.

I think there used to be compatibility between BC and ProjectRed (or others?) in 1.7, although that was before I started maintaining this so I'm not sure. Either way it's not possible now - instead you'd have to take the longer route to test each colour individually, and convert that into a redstone signal, then convert that into the PR cables. Which is a bit of a pain :/