I ask a similar question but no response yet. I did pmed Peterbilt, and got some help from him, also Cravin gave me some tips(thanks guys).
I am on the process but will take my time doing it coz I am still gathering parts(for cheap).
Currently, I just received an Autometer water temp from ebay($10.50 + $10 shipping)
Still looking for a "T" adaptor for the sender, ebay have it for $11 shipped, too bad I missed it.
Please wait a bit more, some will respond soon.
BTW, does anyone knows if our cars have a coolant drainage on the block?