The fuel pressure sending unit is a delicate device, and needs to be isolated from excessive vibration, and not see pressure spikes. Needed is a pressure snubber (lower right) to prevent the spikes, and braided stainless steel line to mount the sending unit in a remote location off the engine.



A great place to check the fuel pressure is between the lower pressure fuel pump (aka lift pump) to the high pressure fuel pump (Bosch CP3). Here is the backside of the CP3 pump, where a tapped 90° fitting provides an 1/8” NPT port, a perfect place to connect the braided line.



The line runs to the cowl above the brake master cylinder, where the pressure snubber (1) and sending unit (2) is zipped tied to the body.