Every website I have been to has said to mount your mechanical fuel pressure gauge outside of your car but I have the stock hood and think it will look kinda goofy just sitting there. Is there any way I can put it inside the car besides going electrical?
Its mounted usually on your firewall under the hood, you run your fuel line to it. from the other side, you run a line to your gauge. that line is filled with antifreze i believe so if there is ever a leak on the fuel line side, it wont leak into the car.
This is an EXAMPLE of how it works and how to hook it up, your application will be different though.