1987 clipper cabrio

Have a 1987 Golf Cab. after changing head gasket, seemed to be running OK. Took it for a spin to check it out and oil light and alarm came on. Changed two oil pressure sensors. Took it for a spin, OK initially, but after a while oil light and alarm came on again. Changed oil pump. Won't start now, no spark. Doesn't seem to be firing on all cylinders. Think I checked obvious connections. Help, don't know what to do next.

poor wiring at oil sensor/switched wires on sensors.no oil pressure no start,(some models)

Thanks very much for your advise will check. Cheers

You may have to reset your distributor position. Put engine on TDC #1 & check the distributor position (notch on housing should align with the rotor).

Thanks for the help, very much appreciated, will check.