I take my reading when the need stops moving as per the book...
When I did my RB20DET I had two comp gauges to use, the lowest set of figures were 149 to 154 psi, the gauge that read higher also achieved a 5psi spread.
Unless the temp sensor rooted, which could be the reason they used a resistor in the first place. If you have a multimeter you can measure the resistance of the sensor when the engine is cold then measure it again when the engine is hot, the resistance should decrease as it heats up.
On a warmed engine with all sparkplugs removed, with accelerator fully depressed and a charge on the battery capable of cranking the motor at 300rpm.
RB20DE/T/26DETT
New = 170psi
Low Limit = 128psi
Max cylinder difference 14psi
...from engine workshop manual.
Just for others reading this thread, it should be noted that some contact cleaners contain a very small amount of lube, while proper Air Flow Meter cleaner does not, you really need to avoid using the lubricated cleansers.