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Re: 1990 454SS tach
I remember that there was an empty terminal wire right at the top of the coil. Used to be able to hook up a dwell tach to read the rpms working under the hood during tune-uos.
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1989 K1500 Chev. EC
Original owner; some of the aftermarket parts I've installed are Borla headers, Hypertech chip, Edelbrock water pump, and a Stillen rear disc brake conversion kit.
2009 Hummer H3T 3.7L 5M (sold)
1997 K2500 Chev. EC 7.4L/ 4L80E
2018 Dodge Ram 2500 HD R/C
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