1968 4 speed reverse light wiring routing

When I purchased my 68 Barracuda 4 speed, the wiring to the trans for the reverse light was missing. My question is this - from the bulkhead to the trans, where is the wiring routed? Does it go along side the speedo cable, or do you route it along the top of the trans? Looks like there may be wire holders on the top of the side cover on the trans. Any help/pics appreciated. In all my years this is the first 4 speed muscle car I've owned.

Thanks FABO