[candychevy87]

i wanna know how to convert from obd1 to obd2 how is this swap done ??

[bszopi]

Here's one guy's story on how he did it - http://60degreev6.com/forum/showthread.php?t=36934

It really depends on what you are starting with, as some may be easier than others. If you are doing it in your Blazer, then the above will probably be pretty close to what you will have to do.