OK got it together. Haven't put fluid in yet, but will explain.
First off, the suction line IS 3/4, duh! Soooo, I used the old hose that was on it (heater hose I think). So that will have to be redone, soon. I THINK I can pinch it off enough to not lose my fluid when I do. At least I can catch it in a bucket if need be.
I decided to post some picks as promised so here goes.
This first pic is with the new tank in it's place and the old one on top of it, just to compare them. All the oil on the old one is only a small portion that had been leaking from the crappy old tank.
This is a shot of the tank (mounted) with the suction line connected. The suction line looks huge in this pic because the previous owner torched a hole in the platform and brought the suction line up through it, and wrapped the suction hose with another old hose to protect it. I re-installed both hoses, for now. I don't have a suitable piece of new 3/4 hose.
This shows the tank side of the whole splitter. The right "leg" of the splitter is white from the degreaser I sprayed on it to clean the years of leaking fluid. Note my filter sits a little cockeyed underneath. When I tack welded the bracket I made for the filter, it "looked" level to me, until I hade the filter mounted. I am going to fix that right after this post. I am sure it will work as it, but it bugs me to look at it.
This is the valve side and you can see where i mounted the filter. I wanted it out of the way and protected, so there it is. All line to and from filter are 5/8".
This is the return side. You can see it come up out of the filter housing and into the street el to the tank. It's all tucked in there nicely. When I ordered the tank I wasn't sure if it would fit up there.
The "legs" on this were added by the PO. The splitter came from the factory sitting just below knee height, and he didn't like it that low so he raised it. Those are big H beams he used for legs. The 1/2" square tube rods are braces to keep the legs from flexing. I am going to remove those and brace them another way. Not sure yet.
Any way it's not the best looking one out there but it will do the job and hopefully the pump will last longer than the previous one, now that I have a filter in the line. Someday I will paint it all orange, just to make it match, maybe

.