I am a Huge believer in changing all the fluids on a yearly basis with the best money can buy. Of course, the engine oil may be more frequent based on miles and severity of weather or severity of my driving habit.

On my annual list are

Engine Oil
Automatic Transmission Fluid
Coolant
Power Steering Fluid
Brake Fluid
Hydraulic Suspension Oil
Wash out the Windshield Washer Fluid Bottle

I have a Schuco Vacuum Pump to suck fluid from the Reservoir, then flush and replace the remaining fluid.

To this point, has anyone installed the Classic Transmission Dipstick from M Euro Sport?

 

that dipstick kit looks interesting . about $170