just bought these off of a fellow fanatic....i have a 2.3d how hard are these to hook up???

are they electric or mechanical?

i believe they are electrical

its a matter of finding suitable locations to install the sending units. i cant help you with the 2.3.
there are plenty of threads here with comments and advise in installing the interior pieces.
remember to route your wires through the firewall and not through the door jamb.