the whole pump and motor is 9inches long,5 inches wide,9 inches deep the pump sits on top of ashby ones(which i would go for, phone them for a price to include pump, motor, press reg,gauge and hoses and fitting u need
id say looking at it it take 2 hous to fit, the motor is held down by 4 10ml bolts couple wires out of it, u need to make a hole to put your reg on outside and hole in your frsh tank for bypass hose apart from that its conect in coming water hose to pump ,connect out going to your sol connecter , there easy

lol
p.s u dont hav to av gauge if u dont want one,some peopl recon they get better pressure without them