In order to hook up a taxi meter, which wire on the speed sensor is the pulse? on 1997 Cadillac Seville STS

I intend to connect the meter lead at the sensor connector. There is a yellow and a purple wire.

by in Chico, CA on April 17, 2012
1 answer
ANSWER by on April 17, 2012
the right way is to use a meter to look at wave pattern. one wire is 5v ref and the other is signal