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George Mirza · 05-23-2009, 08:49 PM

I have an LTM and I have the blue wire triggered by the brake light switch. The blue wire picks up power from the brake light side of the brake light switch, then it goes through a toggle switch on the dash and then to the LTM. When I have stagged I flip the switch on (energizing the blue wire) and when I release the brake pedal it breaks the circuit to the LTM and it starts recording. Works good, but it dosen't record the burnout or staging rpm, but it does start recording before the converter flashes, so you can see the stall speed. Like the other guys stated, they are ment to work with a trans brake.

05-23-2009, 08:49 PM	#5
George Mirza Senior Member Join Date: Jan 2002 Location: North Attleborough Ma. Posts: 522 Likes: 0 Liked 0 Times in 0 Posts	Re: Autometer 6871 tach I have an LTM and I have the blue wire triggered by the brake light switch. The blue wire picks up power from the brake light side of the brake light switch, then it goes through a toggle switch on the dash and then to the LTM. When I have stagged I flip the switch on (energizing the blue wire) and when I release the brake pedal it breaks the circuit to the LTM and it starts recording. Works good, but it dosen't record the burnout or staging rpm, but it does start recording before the converter flashes, so you can see the stall speed. Like the other guys stated, they are ment to work with a trans brake.