[68c10airstream]

Lee, how i addressed this issue with the 2001 in my 68 c10 was this way. I drilled the face of the truck water pump and installed the 68 factory sender into the water pump because i wanted to use the stock cluster. Once the engine was in and running my stock gauge was reading a full 3/4 scale if not more. I cut the wire about a foot back from the sender, installed inline a variable resistor and dialed in my stock gauge to read 1/2 scale at 195 degrees, (another words added additional resistance inline). Removed the variable resistor and measured it. In my application it was 4 ohms. Went to radio shack purchased a 1/2 watt 4 ohm resistor and soldered it in with adhesive lined heat shrink tubing and all is good. Good luck, Brian F.