Volvo Repair: 1992 volvo 960 sedan, flash flash flash, transmission control unit

Question
transmission arrow on dash and at gear selector flashes sometimes and goes out and comes back ever so often

Answer
first I would check for codes in the transmission control unit.below is how to check codes if you get a 313 code this is a nuetral safety switch is bad(AKA:PNP switch or gear position sensor.

in the engine bay on the drivers side near the strut tower there  are 2 small black boxes one has  a wire attached to it.place the wire in the terminal marked 1 on the box marked A .turn ignition key on (not started)press the small button for 1 second and the code will be displayed as a series of flashes.a red led displays the codes.the code will be three digits.small pause in between flashes for a single number long pause between flashes for the next number.example 121 will be flash.....flash..flash.....flash.repeat three times or until first code repeats itself.to erase the code after all codes have been checked hold the button for a good 5 seconds then release the light should light steady,then press for another 5seconds.this will erase the codes.  email me the codes and i will tell you what they are..