Hi Stuart

Oil pressure should be the same as your MGA 45 to 60 psi at 40mph and about 15 on tickover, depending on the state of the engine and pressure relief valve.
Your vibration may be due to prop shaft incorrectly assembled U/Js,wornout u/js out of balance propshaft, bent half shaft, wheels bent, tyres flat spotted, wheels/tyres out of balance, loose bearing carrier, etc. was the vibration there before your rear spring rebuild?
If you look on MG Experience forum and list vibration loads of possible problems and solutions will be found.
Trevor

Can you advise what the oil pressure should be when hot say doing 40mph and also on tick over.
Just installed all new rubbers on rear suspension including having springs repaired by Owen Springs in Sheffield.
I am experiencing vibration when I reach 40mph ,wheels have been balanced ,I not end to swap rear wheels from my MGA onto the ZB to see if this will cure the vibration if not it has to be either prop shaft or if not couldn't be the diff?
any Hephaestus would be appreciated

Stuart