Found this on ebay, would this work with the g40 system?
http://www.ebay.co.uk/itm/Snap-Set-6-Injector-Harness-Testers-Noids-NEW-/220823085126?pt=UK_Hand_Tools_Equipment&hash=item336a14e046#ht_524wt_1141
Dunno, but am curious. Is it just a resistor set, LED and enclosure to test when an injector gets a signal?