We have been working with GSI products for decades. The company provides American made vehicle diagnostic products. This is a DanWilson.Site video production describing the GSI pressure testers including fuel injection testers, compression testers, oil and transmission testers, power steering testers, and brake pressure testers. The company also produces cleaning equipment for fuel injectors radiator and cooling system flush equipment.
Here is the GSI Industries website: www.gsiindustries.com