Dodg Caravan 1991/3.3l - tachometer

The vehicle mentioned in the title has 300,000 KM. Recently noticed the tachometer rises smoothly with pressure on the accelerator, but seems to over-register the engine rpm. The vehicle behave normally in all other respects and the transmission fluid is bright pink. Could the pickup or ECM, or TCM be at fault and where and what is the sensor that generates the tach dashboard display.
Thanks
Reply to
redryderridesagain
I have had the following in a text file on my computer for several years:
1 The 1.6 and 2.0 liter engines are manufactured by Mitsubishi, and are also used in vehicles produced under their name. The same connection configuration applies.
2 When using pin 43 of the SBEC (Single Board Engine Controller) as the tach connection point, the NUMBER OF CYLINDERS selector on the tachometer is set to the 4 cylinder position regardless of the number of cylinders in the engine!
3 In some applications, there may not be a wire connected to pin 43 of the Single Board Engine Controller, however the tach signal is available at this pin. 8 CHRYSLER CORPORATION & MITSUBISHI MOTOR CORPORATION 1 ENGINE CONNECTION DETAILS LOCATION/CONNECTOR PIN NO. WIRE COLOR 1989 1.6 L IGNITION COIL PACK, 4 PIN 3 WHITE 1990 1.6 L IGNITION COIL PACK, 3 PIN 2 YELLOW/BLACK 1990 2.0 L IGNITION COIL PACK, 4 PIN 3 WHITE 1990-93 3.3L, VIN R SINGLE BOARD ENGINE CONTROLLER 43 2 GRAY/LT BLUE3 1990-93 3.8 L SINGLE BOARD ENGINE CONTROLLER 43 2 GRAY/LT BLUE 3 1991-92 3.0 L, VIN U SINGLE BOARD ENGINE CONTROLLER 43 2 GRAY/LT BLUE 3 1992-93 2.0 L IGNITION COIL PACK, 3 PIN 2 YELLOW/GREEN
Reply to
Daniel who wants to know

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