After reading posts, I did check the small hole on lower part of outdrive. It for sure appeared plugged with debris. I will have to wait to get on the water to test if speedo now works as I do not have a way of creating pressure sufficient to test.
Here is my question. The tach stopped working at the same time. I have checked all fuses. Does the tach work in conjunction with the speedo? Coincidence that they both stopped working together or does the water pressure coming through that hole effect both?
Clean the connection on it, measure to verify it get 12V on the power terminal and the ground is good. The gray wire comes from the coil and provides the pulses the tach uses to display rpm.
Speedo and Tach
Linear Mode
