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Since a very basic atmel chip would be enough for this I would say the controller would be less than 3 bucks. A 2x16lcd is under $20. So I would say the whole setup with the vss and injector circuits should be less than $50.
A basic interface to calibrate the speed and fuel might need 2 buttons. With a 2x16 display you could have 4 numbers displayed. So I would say instant MPG, last minute avg MPG, Trip MPG 1 and Trip MPG 2. The buttons could be used to reset the trip numbers in normal use. Maybe use a jumper on the board to put it into programming mode. Be a very simple addition but could make it a lot easier for normal use.
There would be no point in putting a tank mpg on there since one of the trip meters could be used for that or not depending on what the person using it wants to do.
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