1967 Camaro Fac Tach-what powers it? What is this wire?

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Dakota Digital's SGI-100BT Will Bring Your Tach And Speedo to Life

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stock tach not working: what to check? - Third Generation F-Body

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1967-1968 CAMARO FIREBIRD DAKOTA DIGITAL VHX GAUGE CLUSTER SILVER WITH BLUE LIGHTS CARS WITHOUT CONSOLE THIS IS BY FAR THE BEST GAUGES MONEY CAN BUY.

1967-1968 CAMARO GAUGES FIREBIRD METRIC KPH DAKOTA DIGITAL VHX DASH GAUGE TACH

1967 Camaro - How to Install a Tachometer on the Column Shifter

67-72 CHEVY TRUCK PERFORMANCE BLACK - New Vintage USA