Hello, I just purchased my first boat last week. Its a 1996 ThunderCraft Typhoon Jet boat 12' or so, seats 4 or 550 lbs. When I bought the boat the motor wasn't running so I took it into a local reapir shop, the motor is a mercury oil injected 120 HP engine but I was told its a "Force" motor. I am being charged over $500.00 for a switch box, I was told it was like the brain of the motor. It is $250.00 for the switch box and 5 hours labor to install it, does this seem fair?