I just installed Stargazer in 04 Mobius LSV
All in all it was quite easy. I did it myself. To save yourself some time just take up the floor to run the cable to the back. Seat comes up with it and the floor is heavy (may want 2 people but did it myself). I'd give you about a 2% chance of ever getting a fish tape from the steering console to the back without taking the floor up. There is less than 2 inches between the gas tank and the floor to get through. The only other time consumer was taking out the tach and the right speedometer. Need to replace speedometer with new Perfect pass gauge and you may as well take out the tach to connect power and signal for RPM mode. In this boat, a 90 minute install is possible, but more like 2 hours and that is if you take the floor up when you are ready to run the cable.
If I did it again I'd do it like this in this order:
Mount Servo
Take out speedo and tach and wire in the cables for the dash.
Mount Module and plug cables in.
Take up floor and run cable and connect.
Put floor back and test system.
Good luck. Can't wait to try it on the water.