Not exactly sure, but the Sender Unit could be bad also.
Check the connections like they said first. If not hit me up, I have an extra one.

Silver 98 SVT Contour E0 #4121 Reborn with 3L 6/03 Dyno: Max Horse Power= 194.1 Max Torque= 184.8 http://www.geocities.com/speeddemons19 Also at www.cardomain.com/memberpage/561067