Re: Tach
The white wire is correct for your application. On your engine, It does not connect to the ignition switch because the blue wire supplies power to the points and coils. Turning off the switch stops power from the "I" terminal (blue wire). If you trace the white wire, you will see that it ultimately connects to one of the coil negative terminals. Black on the tach will go to ground.
There are no stupid questions--only stupid people!
Nah--Just having fun with you. Yes! The black tube going back to the transom is the speedometer tube. The speedometer is a specialized pressure gauge. The white plastic thing is an impact tube and uses water pressure to compress the air in the black tube. This straightens a bent Bourdon tube within the gauge. The tube is connected by levers or gearing to the needle. The faster you go, the more pressure, the more the Bourdon tube straightens and the higher the needle reads. The impact tube projects at a slight angle from the transom so that the hole is roughly parallel to the water direction. It is spring loaded in some manner and will pop up if you hit anything with it. So be sure it is in the down position. These speedometers are notoriously inaccurate and usually read a bit high. Their main use would be to guesstimate speed for say, recreational water skiing or approximate time to a destination. Most do not read below 10 MPH so are useless in no-wake or 6 MPH speed zones. They do look nice on the dash and make a complete package with tach, voltmeter, and hourmeter, or matching compass, and that's pretty much the only reason to have one.
Dang, Arsenalpsu--I really need to get a model number chart. I can't correlate model numbers with engine years and equipment.
But if you have standard points and coil ignition with the coils mounted on the side of the engine, then any standard 2 cycle tach will work--ie. Teleflex, Tiny Tach, Faria, etc. Buy them on line at iboats or at your local marina supply store.
