I built a 4-way hose myself a few weeks ago. Sourcing parts was the biggest challenge and took me a while to get going. But once I had all the parts, it was extremely straightforward, and I loved the build journey.
Largest parts:
1 x Analog Pressure Gauge 1/4" NPT --> took the longest to secure. I bought it online after scouring through Deira markets and not finding anything less than industrial grade
1 x FlexZilla 3/8" 50ft Air Hose with 1/4" Male NPT (2 of the connections can directly connect to chucks. so you only need additional ones for the remaining tyres) --> available on Amazon & Ace
Industrial parts: bought all of these at a hardware store. Dragon Mart also stocks them.
5 x Brass Hose Fittings - 3/8" adapter + 1/4" NPT Male
2 x 1/4" Female NPT Plug - this connected using a quick-coupler to my compressor main-line
3 x 3/8" Heavy Duty 3-way barb fitting : was used to connect the two cut-away single lines to 2 x tyres + one to bring the two sides of the car together
5 x Heavy Duty Brass Air Chuck 1/4 Female NPT (1 spare)
1 x 1/4" Brass Ball Valve Shut-off switch - 1/4" male + female NPT
30 x Hose Clamps with flathead-screwdowns
Tools:
Teflon tape
Hose cutter (I used a sharp knife)
Some soapy warm water
Like a tailor, measure twice, cut once. I put the hose next to my car and gave it enough slack before cutting.
Good luck with your project