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I have a 1978 Ford F100 4x4 with a 1992 Big Block 460 im building. Im wanting to make a custom gauge, how hard is it to hook up a sunpro speedo?
Explain stock Cable ?....
The Tach has 4 wires
red to power (Under dash)
Blue > Light (Connects Under dash)
Ground > (Connect under dash)
White > Signal..run to TACH (-) terminal to coil