Marshall Instruments CW00015 CW 0-15 PSI

Needed a fuel pressure gauge for my 65 Mustang to ensure my Edlebrock carburetor didn't get too much fuel pressure. Wanted one that was liquid filled and vented to the atmosphere so it would read true pressure w/out being affected by the engine heat. This fit the bill and works perfectly. High quality and competitively priced with an unobtrusive dial.

I had a suspected leaky head gasket on my truck. So I installed this Marshall gauge in the coolant reservoir return line to monitor coolant system pressure and as a safety check before opening the reservoir cap to avoid hot coolant injuries. Works very well. Repaired the head gasket and truck works perfect now, but I left the gauge in place as a routine safety check before opening the reservoir cap anyway. Normal system pressure is 3-6 psi for those interested. Never gets above 6 psi even on the hottest days.

Don't clip the plug!

Installed this and a fuel pressure regulator at the same time. Documents with the regulator stated it was preset to 6.5 psi. Started engine and fuel pressure gauge displayed exactly 6.5.

Appears more durable than the Holley gauge.Steady action.

Time will tell.

Gauge was as described. Oil filled is a plus, keeps the gauge steady. Easy to install and easy to read. Used it on a old truck I have to convert the old manual fuel pump to an electric pump. Needed to adjust fuel pressure to 3.5psi and this gauge was perfect for the job. It's been in use for about a 100 miles now and no leaks. I would recommend it to anyone looking for a low pressure gauge.

Easy to install, quality made!