Sorry for not giving more info at first. The tachometer is a Sunpro Sport ST. I have been doing some research and found that the 99-04 mustangs need a Tach Adapter to run an aftermarket tach because if not the tach will only read at about half the RPM's because of the mustangs having Distributorless Ignition Systems (DIS). But the Sunpro has a setting to be able to use it with DIS. Any thoughts on whether or not I'll still have to get an adapter or not?
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