Temperature sender: one or two?

[Henry/Kokomo]

One more option. . . . I have the stock gauge wired to a single post temp sensor on the left (typically cooler) cylinder head and an after-market temperature gauge installed on the right (typically hotter) cylinder head. I did this after installing a rebuilt engine. By using the two gauges, I can see how hot the engine is running compared to the previous engine (used same sending unit and same stock gauge) as well as getting a temperature reading, in degrees F., from the after-market gauge. I admit its probably overkill. FWIW