gauge help

[67GTSCode]

Well just out of the blue my fuel gauge and temperature gauge just went off the hook! They went way past normal. I have no idea what is wrong.. i supposed they are hoked up somehow but i am a mechanicals person not electronic.. i have a 67 (s-code) coupe gt but i cannot figure out what is wrong with the gauges any help is appreciated.

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1967 mustang gt, coupe, dark moss green, black interior, s-code, 4 speed toploader ( only 1546 mustang gt,s-code,coupes with 4 speed toloader ever made in 67) ... Now it currently has a 302 (for daily driving, i am only 16) an edlebrock 600 cfm 4v carb - wanting dual quads - with a comp cam, pop up dome pistons, headers, msd electronic ignition. 3.00 with a ford 9" gears - wanting 3.50 posi gears. Recently accuaired a 390 from a 69/70 ford truck which is being moddified for some seriouse power