Re: 1997 Force 40 hp
I'm assuming that you are replying to the thread on the water telltale.
Yes you can do it, here is a picture of your '97 40 hp.
Part #20 is a small nylon plug, I think it is 1/4" diameter.
Unscrew the plug, it is on the top of the block, just in front of the thermostat cover. Screw in a brass 90* hose fitting with a 1/8" fitting, available at any hardware store.
Attach a plastic tubing, like what is used for an aquarium.