fusible link conversion
 

i was just looking at this set up for my se and when i was pulling off the fuse set up on the 2nd gen i notice i guess it would be a 2nd ground closest to the shock tower and wondering if i have to hook that up too. Plus what does btn mean on the fuse holder

Doesn't really matter what btn means, and I haven't found it in the FSM, use the circuits as you need them and re-label.

There is a body ground that bolts to the drivers shock tower that is part of the ground cable going to the engine.

but i see 2 of these ground cables

There are no grounds on the fuse block. They are power only, there is a main power in and out, that will replace the main link in the 1st gen harness.

I'm not following you on the 2 grounds, post a pic.

If you ground that block, kiss it good bye and alot of electircal equipment. There is power in, the big screw in the middle and just power out.
http://memimage.cardomain.net/member...9_206_full.jpg

when i took off it from the 2nd gen i saw a bolt holding on the wire on the back just like the front

eat some arco burgers!!
with cheese!!!
leave the oe one it works fine!!

https://www.rx7club.com/1st-generation-specific-1979-1985-18/headlights-cycling-down-up-down-408805/ is a good place to start, I have another link about half way down that page taking you to a great thread on all that is needed for the swap.

cheers