Peter Snowdon Posted June 7, 2014 Report Share Posted June 7, 2014 Help please to correct an inaccurate speedo,  If an auxiliary output is set to speedometer , can it still drive a positive 12v signal to my SD1 rover digital speedo? I have configured a digital input D1 for speedo with a drive high input, thus to accept a positive 12v inpulse from the 2 wire speed transducer. Cheers Snow. Quote Link to comment Share on other sites More sharing options...
Simon Posted June 9, 2014 Report Share Posted June 9, 2014 Yep it will be able to do that. Normally the speedo will have an internal pullup and the ECU switches the ground. If this isn't the case you can add an external 1K pull up between 12V and the signal. Quote Link to comment Share on other sites More sharing options...
Peter Snowdon Posted June 11, 2014 Author Report Share Posted June 11, 2014 Thanks Simon, Just to be sure, is that 12volt supplied resister hooked to the links output to the speedo? 1985 Rover speedo`s not like the modern electronic`s where all imputs switch to ground. Cheers.  Quote Link to comment Share on other sites More sharing options...
Simon Posted June 12, 2014 Report Share Posted June 12, 2014 Yep, So you will have the resistor in parallel with the gauge. Quote Link to comment Share on other sites More sharing options...
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