Well, I'm bored and trying to figure out if I want to buy a dyno or sell all this shit and enjoy life.
There are used SF901's all over the place. I ran one daily 15 years ago and it was a good piece. We occasionally had servo sticking issues, but that was due to water contamination. Not a servo issue. Now, it is no current piece. It won't find 1/4 hp but I don't give 2 hoots in hell about this. Ours seemed to be pretty repeatable. This is important!
How are parts sources? Still out there or obsolete after this time?
You can buy 901's for 15 to 20k all day long with pumps, fans, etc.
My main objective is to throw engines I build on it. Run it, tune it, and throw it out the door. Customers are to damn dumb to let them work on their stuff now days. (seems like half are anyway)