<https://tools2udirectsw.com/products/us-pro-tools-motorcycle-carburettor-vacuum-synchroniser-4-gauges-6888#product>
<http://schema.org/description>
"For monitoring your motorcycles air and fuel intake across multiple carburettors.  An essential tool for balancing your carburettor settings. It can also be used to help diagnose fuelling issues. The set features four mechanical pressure vacuum gauges with brass lock valves.  Each gauge has its own damping and calibration control.  The gauges are colour coded for easy reading and are mounted on a robust metal base for workshop use.  Can be used to synchronise the values of 2 to 4 carburettors.  Comes complete with adaptors, connectors, extensions and rubber tubes.    Contents: 4 x Rubber tubes 8 x 5 x 750mm 4 x M6 x 0.75 Adaptors (Length: 53mm) 4 x M6 x 1.0 Adaptors (Length: 60mm) 4 x M5 x 0.8 Adaptors (Length: 99mm) 4 x M5 x 0.8 Adapters (Length 169mm) 1 x 6 x 53mm Adaptor 1 x Set of 4 synchroniser gauges mounted on metal base"
<https://tools2udirectsw.com/products/us-pro-tools-motorcycle-carburettor-vacuum-synchroniser-4-gauges-6888>