Ralley pack cluster

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fraido2002

Master Mechanic
Oct 23, 2010
254
2
18
40
Mid Michigan
Does anyone know what this red wire goes to. I just purchased a 120mph cluster to replace the 85mph one. The 120 has a red wire going to the green box behind the dash and my original one does not have this plug anywhere. Do I need it and what does it do/go to?

Donor 120mph cluster
IMG_20130404_171900_173_zps43229497.jpg


Original wiring behind dash
IMG_20130404_171907_948_zps9b96e096.jpg
 
I know you are looking for answers although I have none.. However I do have a question of my own. What do the 120 mph ralley pack cluster come in? I have seen a few but never in a car stock did they come in 442 or h/o?
 
that is a speed sensor signal for the ecm for 87 v8 models your module has the place to plug it in but your car doesnt need it the cluster will work without it
 
Sorry to change the subject. Does anyone know what size the tach is in this rally pack? Mine reads about 400rpm too high and the switch is in the "8" plug in the back. Car is at my school's shop so i will be trying to measure it tomorrow but I'd like to have an idea of what it would cost to buy a tach and fit it in. Should the tach wire go through a resistor on the firewall?
 
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