I followed the advice given here.
With some slight differences. My new interface settled at 37,000 baud on Com3. MES found it no problem. There’s no way I’d have known about F9 to set up the MES. So thanks for the link.
Good news is the engine started and it revs. I have a new fuel filter housing on order as there’s a known fault that causes zero fuel pressure. Mine had been showing near zero from the fuel tank.