Found my dads original 1971 duster!

dads71 said
Perfect. Thanks! Here are some pics of the fuel gauge. I just took it off. It smells very badly burnt. If I shine a light in the small open space at the bottom, it looks like a burnt coil in there. Hard to tell for sure though. Can this be taken apart without damaging it??

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Yes...and I believe you have ordered a new IVR from @67fish383S . His parts and instructions are OUTSTANDING and will show you exactly how to take it apart. Here's a link to his thread in case you need it: [FOR SALE] - Solid State Rallye Gauge Instrument Voltage Regulators (IVR)