I just take the harness and connect it to the tach head... take the red wire to the battery post and the brown wire to the coil...hmm negative side... and ground the bezel metal case to the rad cradle when I'm testing them, beats installing them.
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Senior active founding member.
70 3/4 ton GMC Suburban 4x4 250/4 spd.
71 1/2 ton Suburban Chevy 4x4, 350/350
72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane
2005 FLSTSCI Harley Springer
85 FXSB Harley Lowrider
72 Triumph 650 Bonneville 5spd
"Poor people don't have hobbies" Quote from wife.
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