You may have to.

Bayliner 175 speedometer not working. And not the one built into the mercruiser outdrive. I noticed that while all the gauges were working fine fuel trim oil pressure engine temperature voltmeter and speedometer my tachometer wasnt reading anything at all. Turn on the boat and check if the tachometer receives a reading of revolutions per minute from the engine wiring.

Just be really careful trying to get it out so you dont push it back any further. The factory speedo works off of water pressure picked up from a small hole in the front of the lower unit. 175 Owners Manual Supplement Chapter 3.

I have a 2015 Nitro Z7 with a 175 Mercury Pro XS that I loaned to my cousin for a few weeks. Reconnect the boat battery to the boat wiring system. Locate the tiny hole on the leading edge of your lower unit.

Propulsion Related Systems Anti-siphon Valve NOTICE If an engine running problem is diagnosed as fuel starvation check the anti-siphon valve. Speedometer Not Working on a 175-gctid765614. On the nose cone there will be a small hole.

Blow out the line to the transom. Wind in your face. If the valve is stuck or clogged change or replace it while the engine is shut down.

If the speedo moves its likely the pitot is plugged. I checked all the electrical connections and fuses and I noticed that there was one that was connected to the alternator that was a bit loose at the crimp-on connector. Thats where the water enters to get your pressure reading.