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an arduino uno. I have my uno reading the factor CTS and PWM'ing my electric fan based on coolant temp. I also have an AEM 3-wire oil pressure sending unit feeding into it, along with a thermistor behind my bumper to read air temp into my intake/radiator. The clock's hour/minute button feeds back into the digital input of the arduino to allow me to switch which reading displays (Coolant temp, oil pressure, fan duty cycle, or ambient air temp). Here's an early video of my bench-testing it with just temperature and pressure inputs. La-Z-Link It's a very roundabout solution, and far from elegant, but if your Haltech has configurable outputs, you might be able to feed that into an Arduino and use the Arduino to drive the display. Or maybe you can intercept the content sensor signal without disturbing the input to the Haltech. I'd be surprised if there was any less custom solution available to get the Ethanol content to display on a hacked clock. My project above was a fun winter project.
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