Does this harness go up the tunnel or does it go along the rocker to the starter relay? Thanks for your help.

All the 1969 B body harnesses can remember went from the tranny switch directly p to the relay, probably not long enough to go to the rocker panel and back to the relay

Thanks cab. Do you know if there is a tab or clip of some kind on the tunnel?
There was no harness so I'm trying to make it right.
Thanks, mopar to ya

It doesn’t clip to the sheet metal. There’s clips that attach to the trans and ones that go under the bolts that attach the trans to the block.

These are the ones for the bell housing bolts
https://www.classicindustries.com/product/md7121.html

Here’s a pic I swiped from the web for example

That pic you swiped is my photo that I posted on another website when someone asked about the same question. That's my engine/transmission I built and I just added the black line to indicate approximately where the harness runs. Clips are under the engine/trans mating bolt and tail housing bolt. Not on the body sheet metal. If you look closely you can see the two metal clips that hold the harness in place.

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Very nice diagram, JK!

Thanks for posting that.

Thanks that's very helpful.

John Kunkel thanks for the diagram. Do you know where the reverse lights plug in for the harness that goes to the back of the car? This is auto trans. Thanks everyone.

UPDATE on back up light harness.

There is a pigtail connector coming out of the bulkhead connector for windshield wiper motor. Mine was missing. I got it now and all is good. THANKS TO EVERYONE FOR YOUR HELP!