My cruise works, but only intermittently. Peter from GDL thinks it's the amp. I can buy a remanufactured unit on Ebay for $75. The Audiovox is about $100
I read the write up Mayday Mike did about the install on a 126. I like that he was able to use the stock cruise switch.
Has anyone installed this unit on a 124? Attaching the new unit to the throttle looks like it may be more difficult.

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1987 300D 146K Original #14 Head
One eye on the road, the other on the temp. gauge

Gone But Not Forgotten
1983 380 SEL Long gone
1983 300SD Wish I hadn't traded it in on a 90' Corvette
1989 300SE My all time favorite
1995 E420 Went like a bullet