Tachometer - stepper motor replacement

As my tachometer failed I replaced the original coil mech with a stepper motor, luckily the needle was a perfect fit.

The pins of the L293D HW310 are connected to the Arduino pro micro and X27-168 as follows:

L293D HW310 pins

(VCC ) Red VCC 5v+ to Pro Micro VCC 5v+

(GND): Black to Arduino pro GND

(IN1): Green to Arduino pro pin 4

(IN2): Yellow to Arduino pro pin 5

(IN3): Brown to Arduino pro pin 6

(IN4): Orange to Arduino pro pin 7

L293D HW310 connectors

Vin Red 12v+ from car

V gnd white 12v- from car

B+ to X27-168 pin 1 white

B- to X27-168 pin 2 grey

A+ to X27-168 pin 3 purple

A- to X27-168 pin 4 blue

Arduino pro micro

(GND): Arduino GND for rpm signal via voltage divider

Arduino pro pin 2 Purple to rpm signal from voltage divider max 5v

(GND): Arduino GND for led

Arduino pro pin 9 white to LED