If The 68 is like the 69 then the 8 track harness replaces the rear speaker fader switch and everything. The power plug from the dash harness plugs directly to the 8 track harness and then the power flows to the 8 track before going to the radio.
Bear in mind that there are two different 8 track harnesses. The first is for either the AM or the AM/FM mono and as mentioned above the balance knob on the 8 track player controls the speaker fading regardless of if the radio or the 8 track is playing. So to look correct an 8 track car shouldn’t have a dash mounted fader switch.
The second 8 track harness is for cars also equipped with the stereo radio. In this case the radio has a balance bezel on the right side the controls fade when the radio is playing and the balance knob on the 8 track controls fade only for the 8 track.
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My Break Away Squad
1969 Fbird (base OHC, 350, 400HO & Sprint Cvt’s - 400HO & TA ht’s)
1969 Custom S 2dr ht
1969 LeMans (2dr & 4dr ht & Cvt)
1969 LeMans Safari wagon
1969 GTO (2 Cvt, 2 ht & Judge ht)
1969 Cat (3 Cvt’s & a 2dr ht)
1969 Ventura wagon 2 seat
1969 Exec 4dr post
1969 2 Bonnie Cvt's & 2 wagons
1969 Bonnie Brougham (4dr ht & Cvt)
1969 Grand Prix 2 SJ’s
1969 2+2 2dr ht (Canadian)
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