I have done something similar for a 0-50k sender but the other way around.
See http://www.jag-lovers.org/snaps/snap_vi ... 1325761899
You will have to alter the circuit quite substantially as your sender will be about 800ohms(cold) to 10ohms(hot), but the principle is the same.
You will also likely need to change out the 10v bimetallic regulator for a 7810, otherwise your electronics will see a rapidly fluctuataing supply of 12v and 0v, average 10v.
See http://www.jag-lovers.org/snaps/snap_vi ... 1287914415
Your sender and gauge have 10v across them always, but the split is 2.5v across the gauge and 7.5v across the sender when cold versus 7.5v across the gauge and 2.5v across the sender when hot, so that's what you have to reconcile with MS.