Fuel / Temp Gauge - Not Accurate

[kkosche]

I have Superformance Cobra #970. Two annoying things. When fuel tank is full, fuel gauge reads past full (needle goes all the way to the right, off the face of the gauge). After about 30 or so miles (3 gallons of fuel or so) . . it comes down and reads in the range between Empty and Full. The bottom of the tank (I have ran it down to the point of taking 16 gallons to fill it (will show between 1/8 tank and empty).

Second (and maybe related issue) is the temp gauge has never read more than 55 degrees C. At full operating temperature my infrared temp gauge reads ~180 degrees F when pointing the laser at the flat black thermostat housing.

After searching / reading past posts . . it appears that a possible answer could be the voltage stabilizer (I bought one). After looking under the dash, difficult to determine where the voltage stabilizer is located. . . I realize that the replacement might be a little different (given my car was assembled in 1999).

Both gauges are Smith.

Any guidance as to the location of the voltage stabilizer . . and or any other ideas as to my two problems would be greatly appreciated.

Thank you!