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Check the 5v Regulator....... The old ones are crap. My Fuel and Temp used to creep up and down with no reasoning. Updated the 5V Regulator and now they are solid. http://www.mopar1.us/instrument.html



i made one of these using a different design. it was in a magazine as well but i dont believe the mounting tab of the LM voltage regulator was the output pin. I remember screwing the LM volltage regulator to the inside of the case of the old mechanical VR and the case acted like a heat sink. All of the components fit into the case and attached to the original leads so you can pop the unit right back into the dash and it looked stock


Im still running it 10 years later

It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspensions, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas.