Ok, so quick run down of what the motor has been through.
Blew up, rebuilt and running fine.
The re-conditioner lost my original oil pressure sender and I sourced one from another 4JB1 (unknown origin car) from the wreckers. This one did not have the sender wire attached to it, so I made my own cable and connected it to the appropriate receiver wire.
The motor was first filled with Penrite 15W50 semi-synthetic diesel oil.
On initial start-up after re-installing the motor, the gauge read perfectly.
After the first 100km's the oil was dropped and replaced by the re-conditioners "special oil" (unknown to me) and the gauge read 8kg at idle and dropped to 4kg when revved.
As of last night the motor has done 1000km's and the oil was dropped and replaced once again by fresh Penrite 15W50 semi-synthetic diesel oil and is still reading 8kg at idle and dropping to 4kg when revved.
any help is greatly appreciated.
Kind regards
Michael