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    autometer tach

    Ok I bought an autometer tach go's to 10k I believe. Well I have a 94 mustang 3.8l v6 coupe. Well there's the 4 normal wires. Red, white, green, black. Well from the back of the tach there's 2 wires brown and orange. I read on a site that v6 mustangs have to use those wires. . Any ideas where...