u/WankelRotor

Hi after rebuild ”gauge” drops to zero when engine is warm after small press off rews it jumps to its ok place again. Any ideas shat could be the main culprit? Could it be mainpressyre release valve leaking? I remembered there were some tiny washer included in wankelshop harder spring set that went missing but spring was longer and stiffer than oem so didnt bother with them