I know one of these days I’ll be in situation and I’ve been watching as others have asked your Question..
My understanding is that if you replace only 1 unit you have to buy a pc board for the new unit so it will work with the old Tstat.
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John and Sue from W. Texas
2001 DSDP, 3126B Cat
"the Oilfield PAID me to retire, so I did" :-)
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