Yeah that’s mine. I designed that tach amp in March 2021. It runs on the same principles as Techguy512’s. He passed away many years ago.

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79 300TD “Old Smokey” AKA “The Mistake” (SOLD)
82 240D stick shift 335k miles (SOLD)
82 300SD 300k miles
85 300D Turbodiesel 170k miles
97 C280 147k miles