1. Product Overview
The INNOVA 5568 Pro Digital Timing Light is designed for precise ignition timing adjustments in various automotive applications. It features a durable construction and a digital readout for accurate measurements. This tool is suitable for professional and enthusiast use, providing essential data for engine performance tuning and diagnostics.
Key Features:
- Four-function digital readout: Tachometer, Advance, Dwell, and Voltage.
- Patented Skip Circuitry Test for RPMs up to 9,990.
- Heavy-duty, shock-proof ABS housing with a molded boot for fan blade protection.
- Detachable 6-foot leads with inductive pickup.
- Slim, rotating barrel for improved aim at timing marks.
- Compatible with most ignition systems (DIS, conventional, electronic, and computer-controlled systems - domestic and import).
- Designed for one-hand operation.

Figure 1: The Innova 5568 Pro Digital Timing Light, showing the main unit, detachable leads, and battery clamps.
2. Safety Information
Always prioritize safety when working on vehicles. Read and understand all instructions before using the timing light.
- Wear appropriate personal protective equipment, including safety glasses and gloves.
- Ensure the vehicle is in a well-ventilated area.
- Keep hands and clothing clear of all moving engine parts (e.g., fan blades, belts). The timing light features a molded boot for added protection.
- Avoid contact with hot engine components.
- Ensure all connections are secure before starting the engine.
- Do not use the timing light if it appears damaged.
3. Setup and Connections
Components:
- Innova 5568 Digital Timing Light Unit
- Detachable 6-foot leads with inductive pickup and battery clamps
- Plastic Storage Case
Connecting the Timing Light:
- Ensure the vehicle's ignition is off and the engine is cool.
- Connect the detachable leads to the timing light unit.
- Attach the red (positive) battery clamp to the positive (+) terminal of the vehicle's battery.
- Attach the black (negative) battery clamp to the negative (-) terminal of the vehicle's battery or a good chassis ground point.
- Clip the inductive pickup onto the #1 spark plug wire. Ensure the arrow on the pickup points towards the spark plug.
- Start the vehicle's engine and allow it to reach normal operating temperature.
Video 1: Demonstration of connecting and using the Innova 5568 Pro Digital Inductive Timing Light. This video shows the physical connections and basic operation of the device.
4. Operating Instructions
Digital Readout Functions:
The Innova 5568 features a backlit digital screen that displays four key functions:
- Tachometer: Measures engine RPMs, ranging from 249 to 9,990 RPM.
- Advance Degrees: Displays ignition advance for 2 and 4-cycle engines, from 0 to 90 degrees.
- Dwell: Measures dwell for 2-12 cylinder engines, from 0 to 180 degrees.
- Voltage: Shows battery voltage, ranging from 10 to 16 volts DC.
Use the control buttons on the unit to cycle through these functions and adjust settings as needed. The patented Skip Circuitry allows testing up to 9,990 RPM and switches between 2-cycle and 4-cycle engines automatically.

Figure 2: Close-up view of the Innova 5568 digital display, illustrating the various readouts and control buttons.
Adjusting the Barrel:
The timing light features a slim, rotating barrel. This design allows for easier aiming at the timing mark, especially in confined engine bays. Adjust the barrel angle to achieve the best visibility of the timing marks on the crankshaft pulley.

Figure 3: The Innova 5568 in use, demonstrating how the slim, rotating barrel aids in aiming at the engine's timing marks.
Video 2: An overview of the Innova 3555 Advance Timing Light, which shares similar operational principles and features with the 5568 model, including the adjustable barrel and connection methods.
5. Maintenance and Storage
Cleaning:
After each use, wipe the timing light unit and leads with a clean, dry cloth to remove any dirt, grease, or moisture. Do not use harsh chemicals or abrasive cleaners.
Storage:
Store the Innova 5568 Pro Digital Timing Light in its provided plastic storage case when not in use. This protects the unit from damage and keeps all components organized. Store in a dry, cool place away from direct sunlight and extreme temperatures.

Figure 4: The Innova 5568 Pro Digital Timing Light and its accessories neatly stored in the included plastic case.
6. Troubleshooting
If the timing light is not functioning as expected, consider the following:
- No Power/Display: Check all battery connections to ensure they are secure and making good contact. Verify the vehicle's battery has sufficient charge (10-16V DC).
- Inaccurate Readings: Ensure the inductive pickup is correctly clipped onto the #1 spark plug wire and the arrow is pointing towards the spark plug. Check for any loose connections in the leads.
- Intermittent Flash: Inspect the spark plug wire for damage or poor insulation. Ensure the inductive pickup is firmly attached.
For further assistance, refer to the complete product manual available on the INNOVA website or contact customer support.
7. Specifications
| Specification | Value |
|---|---|
| Brand | INNOVA |
| Model | 5568 |
| Material | Plastic |
| Item Dimensions (L x W x H) | 9 x 2.5 x 7.3 inches |
| Item Weight | 8 ounces (0.5 Pounds) |
| Tachometer Range | 249-9,990 RPM |
| Advance Degrees | 0-90 degrees (2 and 4 cycle) |
| Dwell Range | 0-180 degrees (2-12 cylinders) |
| Voltage Range | 10-16 volts DC |
| Ignition System Compatibility | DIS, conventional, electronic, computer-controlled systems |

Figure 5: A comparison chart detailing the features and functions across various Innova timing light models, including the 5568.
8. Warranty and Support
For information regarding product warranty, technical support, or service, please refer to the official INNOVA website or contact their customer service department directly. Keep your purchase receipt as proof of purchase for any warranty claims.