the window switch does the job, and it's pretty inexpensive too.
i have a JNM for sale if anyone is interested. i only used it for a month. it was mildly damaged in shipment and wasn't fully covered by insurance so i glued the small piece of plastic from the side back on and hooked it up. it worked fine for awhile but the the rpm rev limit started kicking in early, whether i was N/A or on the bottle so i took it out and was gonna send it to Jacobs for repair but never got around to it. now that i sold most of my system i don't need it at all.
$50 and i have pics. it's in near mint condition, just needs a repair which shouldn't cost much.
sweet978@juno.com