Hello, I recently obtained a 1993 Glastron with a 150 Force outboard. The motor runs great, but the speedometer is not working. I *suspect* the speedometer input is plugged. I've traced the black tube from the speedometer gauge back to the outboard, and see where it enters--but I'm unsure where the input is....there's no obvious hole on the front of the lower unit. Where is the speedometer input located? Do I have to remove something to check to see if its plugged with debris or similar?
