I found one of the sites that mentioned some caveats with installing this.
To quote:
"
*** IMPORTANT INSTALLATION NOTES **:  The hard start relay will not
function properly in 1986-1991 Vanagon’s with both Automatic
Transmission and Factory Cruise Control due to a relay conflict with the
cruise control system.  If your van only has either an Automatic
Transmission or Factory Cruise Control, the relay will function properly.*

*It has come to my attention recently that running a hard start relay with
the GoWesty Auxiliary Battery Kit or the GoWesty Gear Reduction Starter may
result in complications.  If you have either of these products installed in
your van, the use of the hard start relay is not recommended and will be
completely at the risk of the installer."*
*(from https://www.uniwerksdesign.com/product/vanagon-hard-start-relay-kit/
<https://www.uniwerksdesign.com/product/vanagon-hard-start-relay-kit/>)*

On Wed, Aug 24, 2022 at 9:29 PM J.C. <dougm+sfbayrangers@kzsu.stanford.edu>
wrote:

> John,
> The Bosch WR1 looks like a great option. Is yours a Westfalia? I seem to
> recall reading something about a potential issue using this in a Westfalia
> (but then I did read quite a few discussions about it.)
>
> On Wed, Aug 24, 2022 at 6:05 PM John Lauterbach <john@jhl.mgacoxmail.com>
> wrote:
>
>> For a number of years I had an '82 diesel.   I had the same problems you
>> have.  I didn't know about this list at the time, and replaced numerous
>> starters.  I had the same problems with an '84 I purchased some years
>> larter.   By that time, I had come across this list, and learned about the
>> Bosch WR1 starter relay.  Problem solved.
>>
>> John
>>
>>
>> -----Original Message-----
>> *From*: J.C. <dougm+sfbayrangers@KZSU.STANFORD.EDU
>> <%22J.C.%22%20%3cdougm+sfbayrangers@KZSU.STANFORD.EDU%3e>>
>> *Reply-To*: J.C. <dougm+sfbayrangers@KZSU.STANFORD.EDU
>> <%22J.C.%22%20%3cdougm+sfbayrangers@KZSU.STANFORD.EDU%3e>>
>> *To*: vanagon@GERRY.VANAGON.COM
>> *Subject*: '82 Diesel vanagon. Starter isn't turning over.
>> *Date*: Tue, 23 Aug 2022 21:42:55 -0700
>>
>> For a couple of months it's taken a number (5, 6, or more) of start
>> attempts to get the starter to turn over. Does that seem to indicate an
>> issue with the starter, or starter solenoid, or ground connection, or...?
>>
>> You may have seen my earlier email about a replacement alternator. I
>> followed the advice here and got a properly sized alternator and swapped
>> it
>> in. Thanks for all that help!
>>
>>