When changing the computer in a 95 Cadillac with used one will odometer read mileage of replacement or original car?

The odometer will reflect the mileage of the replacement computer's previous vehicle. It's crucial to understand that this is illegal in most jurisdictions to tamper with or disconnect the odometer in an attempt to change the mileage. Using a used computer with a different mileage than the car's actual mileage is considered odometer fraud.