which wire is tach signal wire
- Thread starter 99GTNOOB
- Start date
What year mustang do you have?
If you have a 99+ and you're looking to tap into a "tach wire", I don't think you'll find one. You would need a tach adapter.
2000fordstanggt
Member
the98stang
Active Member
If you look at the COP wiring there is a red wire (12v +). The other wire is the tach signal. I would rather tap this wire than tear up the PCM wiring.
yea i have been hearing this "tach adapter" lecture and i dont know much about the concepts of the newer mustangs but i find it hard to believe that if i have a stock tachometer that is getting a reading from some source when cant i tap into that same source and get the same readings. all im trying to install is a shift light!! lol but im going with the raptor anyway just was trying to put use the free one i had laying around from my fox
The problem is that the normal tach expects a pulse per spark, which at 5,000 RPM turns into 40,000 pulses per minute. The mustang doesn't do that, it gives one pulse per 8 sparks, which means you need an adapter to translate between the two numbers. Ours is under the hood, on the cowl on the passenger's side, where the big connector for the engine removal disconnect is located.
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