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SGI-100BT: Universal Speedometer and Tachometer Interface
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12 V Tach Signal to 5 V Converter
AXM-100 High Voltage Tach Adapter - DIYAutoTune.com
Easy DIY Adapter - 5V ECU tacho signal to 12V dial | 924 S Turbo Build 59 - YouTube
RPM Adapter, tacho source, signal conditioner, ignition pick up interface with digital output