This is as easy as it gets.
Cut two lengths of solder about 3 inches each.
Paint them using Tamiya’s rubber black (or what ever other color you choose)
Drill holes in the engine and firewall to accept the hoses using the same size drill bit as the hose.
Then it’s just a mater of fitting the hoses where you’d like them to go.
Glue them in place with your favorite super glue and that’s it.
Gaahleri Airbrushes' and supplies: https://www.gaahleri.com/?ref=GrandpaMark
The solder is .95mm (the same as a single strand of cat 5 wire which you could use, but it’s a lot harder to bend and fit.)
https://www.amazon.com/gp/product/B0000DD1QQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1