Yep...you sure can !
Most of the 195's were Indirect Injection (IDI) heads which is well suited to alternate fuels.
Things to remember:
1] Filter and de-water the waste veggie oil (WVO)
2] Starting and warm-up should be done with diesel or biodiesel.
3] Heat the WVO to 180f or higher on the way to the injector
(Some say that the injector will warm the oil adequately but my preference is to heat the whole injector line with a wire heat trace)
4] Switch back to diesel or biodiesel for a few minutes before shutting down
The 195 is an excellent workhorse and is renown for it's reliability.
Nice find !
veggie