When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
You want a fuel pressure gauge. If you're running an EFI late-model car, make sure you get one that can read the higher pressure. If you have an older car with a carburetor, you can use the lower-pressure gauges.