We made the smallest k-type thermocouple signal conditioner on the automotive market! This is a completely custom design based on a standalone digital k-type thermocouple amplifier coupled with a Microcontroller to process and output an accurate and smooth signal to anything that accepts a 5V sensor input. It responds quickly, too – temperature changes are picked up within 125ms.
Simply attach a 5V power supply and ground, and this thermocouple conditioner will output a 0-5V signal in relation to temperature sensed from any standard k-type thermocouple. We personally use it for intake air temps (it’s especially well suited to pre-intercooled turbocharger temperatures in high-boost applications) or fluid temperatures.