thermostat wireing

[Craig Sutherland]

I have a sd33t and recently replaced the thermostat housing. In the old one there were 3 wires, 1 for the gage and 2 for the EGR. On the new one it has 4, 2 each for the gage and the EGR. Any idea how to convert the 2 for the gage to the 1 wire that is there?