Installed a Zerostart one in my 85 TD today. Took about 45 minutes and seems to be working fine. I used the 1 1/2 inch model. No problem getting the 1 3/8 hoses on to it.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

By "no problem" do you mean you only had to curse at it a few times before it would cooperate?

Mine took some coaxing...how's it work so far? I today is the first day I've driven mine since installing the heater, and I wanted to make sure I drove it around to get any air to burp out of the hoses before using the lower hose heater. I'll be plugging it in tonight...

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1985 300TD-euro 352,000 mi
1974 240D (1?)52,000 mi - has a new home now

I took the hose off to cut out a section to install the heater. Putting the hoses on the heater was no problem at all. No cursing.
I filled up the system via the top radiator hose and knew the lower hose was full because coolant was coming out the top of the radiator. I plugged it in and it got hot very quickly.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13