"Great idea of using the black drain hole."
Do you really think the temperature at the sensor mounted externally to the lower part of the block with no coolant flow within a couple of inches of it has much bearing on the ACTUAL temperature of the water at the outlet area of the cylinder head (where temp gauge senders conventionally are located)?
<img src = "http://i801.photobucket.com/albums/yy297/juggalettebubbles/KEVS%20N%20Series%20Tractors/Water%20Temp%20Unit/IMG_0035b_zpssyrjpx4j.jpg">
Do you really think the temperature at the sensor mounted externally to the lower part of the block with no coolant flow within a couple of inches of it has much bearing on the ACTUAL temperature of the water at the outlet area of the cylinder head (where temp gauge senders conventionally are located)?
<img src = "http://i801.photobucket.com/albums/yy297/juggalettebubbles/KEVS%20N%20Series%20Tractors/Water%20Temp%20Unit/IMG_0035b_zpssyrjpx4j.jpg">