The Sealey VSE3157 is a professional diesel compression gauge kit designed for accurate compression testing and TDC location on diesel engines. This comprehensive kit reads compression values up to 600psi and includes a TDC finder for precise piston positioning, making it an essential diagnostic tool for mechanics and automotive technicians working on diesel vehicles. The compression gauge works in conjunction with Sealey's glow plug adaptor kits (models VSE3151, VSE3152, VSE3153), providing versatile compatibility across different diesel engine applications. The integrated TDC finder connects directly onto the glow plug adaptors, allowing you to accurately determine top dead centre position during timing and diagnostic procedures. This kit is ideal for compression testing to diagnose engine wear, valve issues, or cylinder head gasket failures. The gauge's 600psi maximum reading range covers the higher compression ratios typical of diesel engines, whilst the TDC finder proves invaluabl