Tacho Conversion on a 620
 

Mainly for Mike T (aka Cranker V2) as he asked via a pm

Once you have a ECU with the IMMO funtion turned off you no longer need the standard coded clocks and the Transponder from inside the Key.

This makes it possible to replace the Clocks with the earlier Rev Counters and Temp Gauges from the following bikes

748 , 916, 996, 998 But not the Strada, SP or SPS modelsa as they use sequential firing and gice a different Tacho output signal from the P8 ECU

Also the 750/900SSie gauges can be used.

I also suspect some of the ST Tachos can be used but I haven't tried these yet

With the 748 916 996 998 series gauges they come with a small harness connected to a 6-Way Amphenol connector so I remove the 26-Way connector from the original 620 harness and select the five wires I need and fit the matching 6-Way amphenlo connector to them.

These 5 wires and the Amphenol pin they need to go to are as follows

Pin 1 - Green - Tacho
Pin 2 - n/c
Pin 3 - White/Yellow - Oil Pressure
Pin 4 - Red/White - Switched Supply (+12 Volt)
Pin 5 - Orange/Black - Oil Temp
Pin 6 - Black - Earth (0 volt)

To date I have converted 4 bikes
ideally I would like to source the 3-way connector that pluss in to the rear of the Tacho, that way I could make up my own loom rather than having to buy ones off Ebay