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  1. MickeJagekrans

    An R+D Thread - Different instruments.

    I'm pretty sure that the speed signal from the ECU is less than 12V since other threads elsewhere seem to imply that 12V would fry the Koso. The ground reference shouldn't be an issue since pin 10 and 12 on the harness (ground) are joined somewhere on the main harness (can be seen on the wiring...
  2. MickeJagekrans

    An R+D Thread - Different instruments.

    Ah, I see. The big problem for me at the moment is that the speedometer only shows a zero no matter the speed so I'm guessing that the pulse either is not at +5V or that I am missing something else. No rev counters lying around unfortunately. I'm thinking that I should be able to measure...
  3. MickeJagekrans

    An R+D Thread - Different instruments.

    I've got a sneaking suspicion that the speed sender circuit might differ between the TNT-04 and the RX2-N since the RX2-N can handle up to 60 pulses and the TNT only can handle 20. Put in an order for a new RX2-N in case the TNT can't handle the OEM speed signal.
  4. MickeJagekrans

    An R+D Thread - Different instruments.

    Switched +12V is connected to both B/Y and the instrument via the same wire, which as I understand it should not be a problem? (switched 12V (2) already had a spliced-on wire in the sub-harness). Yeah I did formulate myself poorly there, meant Koso speed sender red wire. Current wiring of...
  5. MickeJagekrans

    An R+D Thread - Different instruments.

    Hey @barbagris, do you know if Julio ever got the Koso to work with the OEM speed sensor? I am currently trying to wire up a Koso TNT-04 the same way but am not getting any speed signal. The black/yellow cable in the sub-harness is wired to switched 12V (brown), instrument speedo power out...
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