My AFS kit came with a MP sensor. I'm not using Van's IE-VMP. Also, I note that my LSE ignition box can output MP. I'm still checking on whether I can use that in lieu of the supplied sensor from AFS.
my earlier statement on using Van's VMP setup. I used Van's hose, firewall(restrictor) and engine fittings with the AFS vmp unit. I teed into the vacuum lines for the Lightspeed. You could make your own restrictor fitting (utilize DR's exotic search features) and buy the proper hose. I was not smart enough to figure this out before ordering the FF kit. Maybe on the nextplane.
David
Getting back on my own question: Can I use LSE's MP sensor output? Per AFS, no.