This device is sold by Dallas Mustang and enables you to re-calibrate your speedometer on Mustangs that do NOT use a speedometer cable where you can change the cable drive gear to correct speed. Extremely handy when changing rear end gear ratio. This was on a 98 Mustang that had a Tremac 3650 transmission. Check out the following link below for full details of install information.
$60.00
http://www.dallasmustang.com/pages.php?pageid=37
$60.00
http://www.dallasmustang.com/pages.php?pageid=37
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