I'm looking to convert my w50 mechanical speed sensor for an electronic one. I see few online that look like they would work, like the one on LCE but it's listed for 79 and up. None of them specifically say for 77. Anyone know the best cheapest way to convert this thing to electronic, maybe one from another vehicle?

 

Did you ever find a solution to this? I'll be needing to do the same soon on my '78. Thanks.