It was found that the cheap manifold pressure gauge has slow response that it was unusable. A small experiment was conducted with the conclusion that the gauge unit is the slow one not the sensor

Response testing and calibration of selfmade display using AVR microcontroller

Then the next stage of execution where the digital display is going into the dash and spare one gauge space for AEM AFR gauge

Gauge cluster disassembled

The old gear indicator LCD is going to be replaced with two lines of 7-segment display

LCD removed and we can see the backlight LEDs underneath

7-segment display that is going in

Soldering the individual display

Testing it

Everything have to go

Done

How it looks like