I'm so confused; The oil pressure gauge in my 89 Tc has quit. I think that the sending unit on the engine is probably to blame, however there appear to be 2 different types of sending units. The first is sold by auto zone, checker etc. and sells for around $30. The second, sold by Chrysler is a little different looking however costs closer to $90. Are both units functional for the little oil turbo cooled cars, or is the Chrysler unit the only one that will perform correctly? I know that some of the minivans had air cooled turbos and am worried that the oil pressure sensor units may have been different.