* Oil Pressure Sending Unit Port: This is the most common and recommended location. The engine block has a port specifically designed for an oil pressure sending unit. This port is usually located on the driver's side of the block, near the distributor. This is a convenient and clean installation. However, it's important to note that you'll likely need an adapter fitting if your gauge uses a different thread size than the original sending unit. The factory sending unit is usually 1/8" NPT.
* Oil Filter Housing: Some oil filter housings have a port for an oil pressure gauge. This is a convenient location, but requires an adapter that screws into the port. It offers a slightly more direct reading than the sending unit port. The advantage is it's usually a straight thread and sometimes readily available, especially for aftermarket filter housings.
* T-fitting in the oil line: This is less common and generally less preferred. You'd need to install a T-fitting into an oil line (preferably one with a lower pressure, such as going to the filter) and tap into it there. This is more involved, requiring more work and potentially more risk of leaks if not done properly. This method is generally not recommended for beginners.
Important Considerations:
* Thread Size: Pay close attention to the thread size of your oil pressure gauge and the sending unit port or adapter you're using. Incorrect threads will lead to leaks and potential damage.
* Gauge Type: Make sure your gauge is compatible with the pressure range of your engine.
* Adapter Fittings: You will almost certainly need an adapter fitting, unless your gauge is specifically designed to fit the original sending unit. These adapters are readily available at most auto parts stores.
* Professional Installation: If you're not comfortable working on your engine, it's always best to have a qualified mechanic install your oil pressure gauge.
Before you start, consult a repair manual specific to your year and model Chevy 350. This will show you the exact location of the oil pressure sending unit port and any other relevant information. Remember to use appropriate sealant on any threads to prevent leaks.
