with the NC35 at least you cetainly need the resistor... and its the orange/black wire behind the speedo... the ECU is measured to cut out if the circuit is broken... or revv to only 5,500rpm then stops firing if it gets a voltage reading of 12V... i tested this over and over.. just to make sure :P and its falled apart and ive tried straight short circuiting on side of track and it still dont work.. it needs X voltage to run proper, and thats the resistor thats inside the speedo unit... and NC30 is the same im sure, although i havnt done the trying over and over... As for blackbox's... yep i have an M MAX box right here... all they are is a big, easy, plug in resistor... measured resistance is about 2k2... anywhere between 1k5 and 2k5 i think did actually work... never undersood why M MAX box was 2k2 when resistance across speedo was 1k5... anyway.. too techie.
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