BBK Performance Parts 1706K Billet Adjustable Fuel Pressure Regulator & Gauge Ki. Billet Adjustable Fuel Pressure Regulator & Gauge Kit. 1986-93 Mustang 302/351 Includes. BBK Billet Adjustable Fuel Pressure Regulator. JEGS 5.0L Fuel Pressure Gauge Kit. Around here, we don’t just sell parts – we rely on them when driving our own cars around racetracks, dirt trails, and interstates across the country. Parts may be our business – but grease, fuel, exhaust, power, and speed are what we live for. Today, more than 350 people are employed by JEGS and the business draws in hundreds of thousands of customers each year. Yet, we maintain the culture stared by Jeg Coughlin from the very beginning: a family-run performance shop that preserves a trusted relationship with each and every customer.