Are you planning to install the gauge in the car permanently or just use it to check the fuel pressure as a diagnostic aid? The former is insane unless one wishes to experience self cremation should the gauge spring a leak, the latter should be feasible, a mech pressure gauge is a mech gauge. I don't see any reason why it wouldn't measure gasoline pressure instead of oil pressure.
"what is it" that makes a Fuel pressure gauge "any safer" than an oil pressure gauge ? (Both having liquid to leak) yes ,I know gas explodes ,oil doesn't. But if "Plumbed properly", " After" I get my Dash MADE, I would like to have a fuel pressure in the dash along with all the others, oil, volt, boost, vacuum ,temp, fuel etc. But for OUTside Temporary use, an oil pressure gauge Could be used to monitor fuel pressure after changing a pump)
"what is it" that makes a Fuel pressure gauge "any safer" than an oil pressure gauge ? (Both having liquid to leak) yes ,I know gas explodes ,oil doesn't. But if "Plumbed properly", " After" I get my Dash MADE, I would like to have a fuel pressure in the dash along with all the others, oil, volt, boost, vacuum ,temp, fuel etc. But for OUTside Temporary use, an oil pressure gauge Could be used to monitor fuel pressure after changing a pump)
Gasoline is a solvent, it will degrade seals over time, especially if there are any materials in an oil pressure gauge not suitable for gasoline. The only safe way to use a mechanical fuel gauge in the dash is to install an isolator in the fuel line and connect the gauge to that. Here is one made by autometer, the isolator stays in the engine compartment. http://www.autometer.com/ca...sdetail.aspx?vid=164
If you want a fuel pressure gauge in the engine compartment for any engine that has a Schrader valve for checking the pressure buy one of these and do it right: http://www.summitracing.com/parts/acc-74745
Any fluid under pressure in the passenger compartment IMO is not a great idea. You can install an electrical gauge for pressure and run the wires.
Ive had dozens of cars myself that had mechanical oil pressure gauges in the dash (or under) that had plastic or copper line to it. I never had a single problem, and never heard of anyone else having a problem either unless they didnt do a good install. In older cars, they came from the factory with them. Personally I like real gauges for temp, oil and battery instead of electric ones or idiot lights.
Mechanical gauges generally can be used for both oil and fuel, and it can be done safely. You just really have to think the system through carefully to make sure leaks won't be catastrophic (i.e. fuel should never be able to leak onto something that could ignite it). There are a number of companies that make universal mechanical gauges. Since a Fiero is a mid-engine car, the fuel line length to the dash is longer than most other cars. Personally, I think you are better off with an electronic gauge, since you can minimize the length of fuel lines and minimize the number of connections that could leak.
