I ordered two Gates 33188S thermostats from Rockauto.com and they arrived yesterday, but in the box are MotoRad thermostats. Grrr. I read on other forums (Miata) that Gates is just getting what they can and putting them in boxes.
Because this forum has evolved to thermostat trouble and I’ve solved my gauge issue, I’m moving the conversation to a more applicable forum for future users:
"Motorad" high-flow thermostats - #60 by MattFurness