- Enables a technician to accurately set a piston to top dead center.
- Just remove the spark plug, screw in the gauge, and rotate the engine while observing the radial marks on the sliding shaft. Note the top of the piston stroke!
- DO NOT use on an engine that has an acute spark plug angle relative to the flat top of the piston, or you may bend the TDC shaft
- Best used on HEMI type engines
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