So, there I was, taking a spin in the boat we just launched with my girl, pushing all the fancy buttons and twisting the knobs to make sure everything was properly shaken down during sea trials so I could run the boat from Maine to New York in the morning. Everything turned out fantastic, engine ran great, good healthy sound from the exhaust, excellent throttle response, enough to make your head surge back as you jam everything forward. Slid back to the float and tied up for the night, daylight quickly creeping up on me.
Fired the engine up in the morning, pulled away from the float, punched the throttle and began my trip.
Wait a moment, where's my throttle response from last night?
Sensor went down over the night apparently, wouldn't show a fault on the panel so as far as I knew, everything was fan-frickin-tastic. Took the tech two hours to get up to me, after finally getting them on the phone. Checked it out with the fancy laptop and it was all great, he didn't believe that there was a problem. Tossed the ropes off the cleat and put it in gear, DING DING DING there's the problem. "You need a sensor" great, go grab it out of your van there and slap that sucker in, I am late to get this show on the road. "Oh, we don't have any in stock, so I don't have one. It will be at least 3 weeks before we get any in" Well now, you had best be making some phone calls because that's not going to fly. I don't care if you have to bend a fork into damned origami to get this pig up and running but it will be done today. (luckily for all parties involved my father stepped in at this point and asked if there were any other engines like the one in the boat in stock, there were, so he suggested that they pull the sensor out of that one and put it in this one so we could get the boat delivered) "But it's not the same color" Color comes in a can, go get the sensor. So the tech drove 1 hour south to meet up with another tech who drove one hour north. About 6 hours of downtime for a boost sensor. Crisp oxford white engine with a beige boost sensor. To the best of my knowledge that sensor is still in place and going strong.
When they work they work
When they don't work, chances are the words coming out of your mouth will make sailors blush and mechanics leave the room
It would be worth the investment to have a spare set of sensors, even when the sensors fail the computer resorts to come home mode so you should, in theory, be able to make it back to port. If you lose your electrical system you're screwed, best make a drogue and figure something else out.