I am installing a HESCO t'stat cover with the second transducer socket. For now I will just put a plug in it, but does anyone have suggestions on a digital gauge with a screw-in transducer? I know of some that strap onto the radiator hose, or fix the the tank surface, but not the screw-in type.

Thanks.

Just about every high dollar guage does.

I have used the glowshift gauges in the past.
the sender is 1/8 npt screw type

a quick search on ebay and found the following:

http://www.ebay.com/itm/52mm-GlowShift-Black-7-Color-LED-Water-Temperature-Gauge-w-Sensor-GS-C706-/370637352082?hash=item564bb52c92&vxp=mtr
a bit sporty looks, but I like the fact that they are dark when off

there is also a digital one

http://www.ebay.com/itm/52mm-GLOWSHIFT-RED-DIGITAL-SERIES-WATER-TEMPERATURE-GAUGE-w-SENDER-/371076186237?hash=item5665dd407d&vxp=mtr

Looks cool! Thanks.