Matt's 95 Stang

So I bought and installed a SunPro 3 3/8 in dash tack to mount on the dash because my gauge tach is going south on me. So after is installed I noticed that the SunPro runs about 200 -250 RPM higher that the engine is running. I know its high because I drove the car enough to know what the RPM is doing at just about any speed, so you might ask why care if you know what the RPM is anyway? Because I spent money on this damn thing, took the whole dash apart to put it in, and now its not working. Any help would be great!

Thanks,
Matthew

Matt's 95 Stang

bump!