Im in the process of repairing all gauges on my boat and I replaced the tubing from the speedo. I can blow in it and the needle moves. I found where the tubing fits into the 90 degree on the motor but where is the water intake to build up the pressure? Im wanting to clean it out to see if that will get it working but I have no idea where it goes in or how to clean it? Any suggestions or advice would be great!