I didn't buy a kit but had a known working monovalve from a 123 that I stole the guts out of and inserted into my 126 monovalve. it has an extra connection on it.
Anyway, is there a trick to installing these parts?
I just pulled the top cover, took the entire guts out and inserted into the body then replaced the cap.
probelm is the thing doesn;t seem to be consistant and either gives me full heat or no heat. I do not hear it cylcling making me think I installed soemthing wrong here.
Thanks in advance.

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique