I was able to borrow gauges last night and results of this mornings testing are[caveat, the low side gauge on the set is apparently broken,I used the low side gauge from my charging hose] [caveat,I am using an r12 substitute from enviro-safe called Industrial 12A,I am aware that it is inferior to R12 but same cutout symptoms existed last year with R12]

Outside temp 62,temp at front of radiator 85

car off pressure equal at 90

car idling low side 35 hi side 175 vent temp 45,switch to econ gauges slowly toward equal and vent temps 65

car at 2000 rpm low side 22 hi side 180 vent temp 35,switch to econ gauges slowly toward equal and vent temps 65

Am I right to say my delta is 20 at idle and 30 at 2000 rpm?
The reading I have done tells me my pressures are slightly low?[This is supported by sight glass boiling]I have always charged by sight glass,which I know is not perfect,the boiling now may be a result of losses involved with multiple errors when hooking up gauges.

Any conclusions?

Am I correct to expect the electric fans to be running any time the compressor is engaged? Now they seem to only operate with engine temperature.

Speaking of which,my dash temp gauge operates [and has for 80k miles] at 80C,do i need a thermostat and can that affect my AC?

Any feelings about my belt tension being too loose?[New belt,good tensioner set at markings on housing but belt can be removed from upper pulley with two hands straining.

Is there a way to defeat the speed sensor without dropping the compressor?[when vacuuming before charge there was no soiling of vacuum oil,bearings/seals in compressor may not be as new but are not shedding pieces]

As noted my cutout does not happen in the driveway,I have closed my hood with gauges attached and will read gauges next time cutout occurs [It is cool today so it may not happen]