Looking for advice on install

I recently purchased a set of k5hl horns, and are in the process of working on the instal. My setup is going to look like this, please let me know if something needs to be changed as i would only like to do it once. Just some specs on what i have, AZ OBII, 200/165 pressure switch, 1/2’’ reg set at 125 psi, 6 gal air tank with 1/2 in ports, K5HL (currently on stock manifold but will be broke down and put on individual brackets), GC 350 solenoid, 1/2’’ dual inlet manifold with (6) 3/8’’ outlets.
My questions are: Since the horns will be broke down, do i need to keep air line lengths the same to provide equal speed of air getting to each horn? Also is 3/8’’ air line enough coming off the manifold to provide good volume to each horn since i will have 200 psi tank pressure with 125 on regulator? I am new to the train horn world and would appreciate any veteran help i can get. Thanks in advance.

Air line length from valve to horn should be close unless you like hearing the horns activate separately. Air restriction is always at the norrowest point so 3/8" air line is fine if any port or junction is smaller.

The pathway of the air will be 1/2 regulator coming off tank fitting of 1/2’’. Then 1/2’’ push to connect to 3/4’’ bushing to make up to 3/4’’ solenoid. 3/4’’ bushing back down to 1/2’’ to plug into 1/2’’ inlet of 6 port manifold. From there it will be 3/8’’ push to connect fittings going to each individual horn. Do you think this will work or not?

All hose sizes are O.D.

The 3/8 will definitely work if you’re branching 5 lines out of a single 1/2 pipe. Keep length roughly the same but you don’t need to be millimeter perfect with it. just remember that the longer the hose the larger the resistance to push air through it. If you have a manifold that splits into uneven lengths you’ll get more flow going through the shorter lengths.