I used a used “BBQ meat” temp sensor (less than 6$ in big stores ) . I removed the temp probe from the stainless steel needle gauge. I put a heat shrink over the probe and installed it at the hotter spot (except glow plug) on the engine body. In a loop shape in the cooling fins of the engine. I program the gauge to 200C so it start to beep as a warning. Its instant temp reading only but I can ride with or without it as required.

See Yaa!
Frank_514