Posted by nvaccaro on 05/23/09 - 7:44 PM
#1
I am replacing the instumentation on my Montauk. When I bought it, she came with a voltmeter and a tach. I'm installing a new voltmeter, tach, fuel gauge and a speedometer. My father says that some outboards have an intake in the lower unit so you can keep from installing the pickup tube to the transom.
Does anyone know anything about this? I have a 90's model Mercury 135. I don't really know what to look for. My other question is this: Is there a port somewhere under the engine cover where the hose from the speedo connects?
Any advice would be greatly appreciated. Thanks.
Posted by Seafarer on 05/23/09 - 8:56 PM
#2
On the top of the lower unit where it attaches to the center section, on the flat of the cavitation plate but around to the front side, there would be a barbed fitting to attach a plastic line to, that would be the pickup for a water pressure speedo.
Otherwise, a pitot tube is probably your only option short of an electronic paddlewheel for a digital gauge or GPS speedo (more accurate than water pressure).