Holley EFI Coolant Temperature Gauge 553-128 | Standard Replacement Paper Gasket, Fits All Holley Bowl Screws. Holley® has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR® Sprint® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers®, Flowtech® Exhaust, NOS® Nitrous, Weiand®, Earl's Performance Plumbing®, or Diablosport® - Holley products can give you the edge you need over the competition.