Help!: How to install a Tachometer on G16A Engine (distributor-less)

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Hi Tsikoteers,

hope somebody can assist or look for a good shop that can install a tachometer to my Suzuki APV.

tried a number of electrical shops in my area and discovered that its quite hard to install a tachometer on my engine.

Details:

Suzuki APV Gen1
G16A Engine (EFI - Distributor less type)

co APV owners said that it needs to be tapped daw directly from the ECU.

another electrician said that I need a shop that has a computer that can connect to the ECU to find the signal line for the tachometer...

thanks in advance!