Even though my radiator in my avatar is a Walker and not separated, I run two separate aftermarket mechanical gauges, one off of each head. Since I also run a heater and I use later 59ab heads with two outlets in each head, I join the heater hoses together off of the heads so the temp readings are pretty accurate and I figured it was better to draw from both sides of the engine when I run my heater. The pass side runs maybe 5 degrees cooler but I have a sticky thermo in the driver side head. A fix for this winter ....