kit to make speedo work on a th350...
https://ls1tech.com/forums/automatic...eedo-work.html
http://www.thirdgen.org/techboard/tr...ed-manual.html
https://ls1tech.com/forums/automatic...questions.html
And google "th350 conversion electronic speedometer".
There are "converters", but they tend to be very expensive ($500+) and wear out after after a few years.






