install of a/f gauge on 88 TC

ok what wire is the signal wire that i tap into on my o2 sensor? coming from the o2 sensor is 3 wires, 2 whites on top and a black on bottom, i think its the black but not positive, which is it and how exactly do i tap or splice into it. thanks!

Black

yes thats what i thought...its the black coming out of the o2 sensor right...now how exactly do i tap or splice into that wire to hook up the purple wire from the a/f gauge?

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88 Turbo Coupe,3"DP,3" Race Pipe,custom Y-pipe,Dynomax Ultra Flows,2.5" ATR SS Tailpipes,K&N filter,Gillis Valve,255 HP Fuel Pump,Kirban AFPR,HKS SSQ BOV.Ported Intakes,Ported E6,Volvo front mount,T3/T4 awaiting install!

I'd splice into it on the harness side of the connector - so if you change the 02, you don't have to rewire. Soldier the connection ands wrap it.

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88 TC X 2, 86 SVO, mods list at
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Sorry to hijack, but I have a related A/F question.

On pre-87 cars without the heated 0₂ sensor, any idea how long before the A/F should register a reading? Does it wait until the exhaust reaches 600°F?

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86 TC, 73 Mini, 72 Mini Van project (w/ LS-1 motor)

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