Fangrui Product Details Ignition Points-to-electronic Conversion Kit Model Or Series: Ignitor For V8 1957-1974 Trigger Type: Hall Effect Voltage: 12 Volt Ground: Negative Ground Distributor Advance Type: Vacuum And Mechanical Advance Multiple Spark: No Lobe Sensor: No Includes Rev Limiter: No Compatible With Cd Ignition Boxes: Yes Fits Distributor(s): Fits For Single-point Distributors. It Is Not For Use With Solid Core Spark Plug Wires. Operating Voltage: 8 V To 16 V Dc Temperature Range: -50 To 300f Rpm Range: 0 To 15,000 Rpm 12-v Ground (some 6-v , 6 12-v Pos Ground Kits Available) Note: Installation Guide Not Included, We Strongly Recommend You Professional Installation. Please Check As Much As Possible To Make Sure The Item Is What You Need. Tips: The Product May Be Updated Constantly ,due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use The Color Of The Accessory Harness Is Random, No Specified Color Is Accepted Color: As Shown Material: Plastic+metal