Temperature gauge

School me on the mechanical temperature gauge.

I have a 801 Diesel.
I have seen several post over the years about the poor fit of the temperature gauge bulb into the head of the 4 cylinder tractors with the aftermarket gauges being sold.
I just did not pay attention enough to remember the details.
So before I go off half cocked and buy the wrong gauge and have to fight making it work; fill me in on the details of what I need to know.
 
The only problems I've had is when you screw the bulb into the head sometimes the nut will not tighten enough to prevent leakage. This could be do to a poorly made temperature bulb and nut, but I think in most cases it is due to corrosion of the threads in the head. On those occasions I have taken a lock washer of the appropriate diameter that is slightly smaller than the threads and cut a slit just big enough to fit it over the capillary tube and between the nut and bulb flange. This moves the nut back far enough that the nut will fully tighten.
 

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