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200 TQ oil pressure warning

Hi folks.  It's been a while since I've posted or have been a "regular" 

Last Jan. 1 I traded my '89 100Q for a '90 200TQ.  What a difference, what an 
upgrade! I love the car, but have one niggling problem I'm hoping someone can 
help with. About once a day during my 21 mile commute to/from work, the oil 
pressure warning light/symbol comes on briefly, with the accompanying chime. 
This has happened at idle, but mostly while highway cruising. Oil level is 
fine, oil was recently changed with 15-30 weight by the dealer, and the oil 
pressure guage will be reading fine, 3.8 to 4+ bar. So, the actual pressure 
seems fine. 

My mechanic has looked at it a couple times and replaced the pressure 
sensor/sender unit. It seemed better, but I still occasionally get that 

Anyone BTDT or have ideas?  My next guess would be an electrical contact 
behind the dashboard. 


Frank M. 
'90 200TQ
'88 Mazda 323 GTX