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Hi Tony:
The 'noid light (an LED and some resistors, by the looks of things) plugs into the injector harness. If the light pulses during cranking/running, the electrical components driving the injectors are good. It is a good way to look check for ECU failure as well as other components in that pathway-- the classic failure mode for the -561 ECU is to fail to ground the injectors.
I understand iPd sells the specific 'noid light for the Bosch, and I'd bet that you could borrow one as part of the tool loaner program at places like AutoZone-- you can borrow a kit here in Canada from Partsource (like AutoZone, only twice as expensive with worse service).
Cheers!
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