DuoWing Posted July 7, 2014 Share Posted July 7, 2014 I'm about to install an autometer electric speedo into my 76' to match my tach and I had a quick question on the wiring. I have the early style 5-speed, so I've already cut a flat into the 240sx speed sensor and installed it. I see that the instructions show to ground one wire and use the other for the speedometer's signal. Now I'm not sure if it matters which one I use? I'd assume the yellow/black would be the one I ground out? Also I was thinking that I could then run the wire to my z31 ecu which would then also take care of the speed code and also finally allow the ecu to operate the maf burnoff properly. So in that case would I still ground the one wire and then just run the other to the speedo and the ecu, or would I run one to the ECU and one to the speedo? Quote Link to comment Share on other sites More sharing options...
winstonusmc Posted July 11, 2014 Share Posted July 11, 2014 You will run one to ground and the other go the speedo, but the ground should be shared with the speedo ground. There should be an output on the speedo to run to the ECU. Quote Link to comment Share on other sites More sharing options...
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