Randolf80 Posted 8 hours ago Share Posted 8 hours ago So the tach and speedometer doesn't work occasionally they come on but not consistent can't find a schematic anywhere I ohm out the speed sensor and it was in spec I'm waiting on a tach sensor to come in.. what's weird to me is there are sensors but no ECU any direction would be appreciated thanks Quote Link to comment https://www.bigmacktrucks.com/topic/76206-electrical-issues-rd690s-1990-speedometer-and-tach-doesnt-work/ Share on other sites More sharing options...
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