The "pressure sensor' is that device on the firewall that is connected with a hose to the engine and has a plug connecting to the loom. Get a second hand one from somewhere and just swap it over to make sure it's OK. it uses engine vacuum to determine the engines fuel requirement so that hose must also be OK.
But you cannot just guess your way through a Djet by swapping stuff over. there is a right way and wrong way to fix injection .
Start by tuning the ignition so it is PERFECT .
Replace the fuel filter with a new one. And any of the rubber hoses by the tank.
then do a pressure test on the engine. Average pressure at the cold start valve is 28PSI. More than that and the pressure regulator(s) has failed or the return line to the tank and in the tank has become blocked.
Theres lots more to check but that should get you on the way.
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