Re: overheat buzzer
Which part of your overheat circuit is not hooked up? There are two components to this circuit. The buzzer, which should be under the dash, gets 12 volts from the ignition switch. My manual shows it to be the red/blue wire from the switch. The other wire from the buzzer gets routed back to the the terminal block on your outboards port side just behind the starter motor. My manual shows this to be an orange wire, which should be the fifth terminal from the top. This then gets connected to the thermo switch, which is installed in the cylinder head. The termo switch acts just like a light switch in your house, if the engine overheats the themo switch closes and your buzzer will sound.
Hope this helps you out. The manual I'm referencing is the actual Force manual for both 85 and 125 HP outboards. If you plan on doing your own work it would be wise to invest in a service manual. Even my Seloc manual has a pretty decent wiring diagram, but most here will recommend the Clymer manual. I found my Force manual on Ebay after being disappointed in the Seloc!