The one by the t-stat is the 50C temp sender for the trans. It connects to the switchover valve near the blue flying saucer on the fender.

I only recall one near the glow plugs - for the temp guage. The lead for this sensor goes in the glow plug harness and connects up near the glow plug relay.

The 105/115C is used for cycling the A/C at 105C and cutting it off entirely at 115C.

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Brian Toscano