Wasn't going to even try to start the Deli, but stopped in to Napa to pick up a block heater for our other vehicle and noticed this little thingy for testing your block heater to test that it's working.
I was looking for something like this a couple years back when I wasn't sure if mine was working in my Deli (it wasn't).
Just wanted to post this - turns out the one installed this time last year is still working, well, so says this little thingy.
15 bucks at Napa
