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get a decat with 2 lambda holes and just put the lambdas in as if it was a normal cat! i got a decat from NW performance quality product cheaper than most places and well helpful as well
I have a yozza decat and it came with a plug in the second hole (to the rear). I just removed the second lambda sensor and wrapped the socket in electricians tape and cable tied securely out the way.
Surely if you put the second sensor in this is what will put the dash light on.