240v hot tub, 120v blower

[Happster]

I have an Onyx hot tub manufactured in 1999 by Sunset Spas out of FL (and out of business) with a Hydroquip P2EFA2L-95004E0 control.  You can wire it for 120 or 240.  I got it from a guy that wired it for 240 and I want to do the same.  I've never run it.  For some reason he had no blower option. The button is there, the air lines/plumbing are there and there is even a connector/plug for it at the control box.  But only the neutral and ground wires exist in the plug.  The hot wire in the diagram only shows a connection to the 120v connector option.  As noted, I'm wiring for 240.

But I have a 120v blower and would like to run it. The pump is clearly 240 volts.  I know I don't want to run the blower on 240, but the Ozonator and the diverter valve are both 120v and getting 115v confirmed between hot/black and neutral/white when the pump is running.  The Ozonator hot lead runs to the psi switch output and the neutral to the 120 side of the "convertible section."  The diverter valve is wired differently, is not in the diagram and appears to have been added by the prior owner. I'll spare you a description of how they wired that, but it borrows hot power from the double pole pump switch and neutral also goes to the convertible section.  (I'm getting a groan from it...it may be toast.) But the diverter is also getting 115v the way it is wired and, like the Ozonator, only has power when the pump is running.

Is there any reason I can't just piggy back onto one of the 120v fixtures with the blower?  Would you do it through the PSI switch or the pump switch? The diagram and another little placard from the control cover are attached.  

Thanks in advance!