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Most alarms come with a default setting of reading tach (RPM), so you have to teach the alarm the tach settings of your car. If you don't see any wires connected to the tach wire of your car, you must change your default setting from tach to voltage.
Another important note, if the alarms aren't the same make, you can't just connect wire color to wire color. You need to know the history of the install (positive/negative polarities) or you will burn a circuit. And don't touch wires to other wires if you don't know what they do because you could damage something. All wires on the alarm have different purposes and are inputs/outputs, different voltage thresholds, etc. Hope this helps.
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