I bought this p75 and I think it’s chipped. How do I tell if it has been converted to a p72?

 

No, VTEC has not been added to this board. You are missing IC14 along with other components.
Here is a link to what you need. VTEC-1980 Conversion Kit [VTEC-1980] - $20.00 : Moates.Net
If you have basic soldering skills you can do it yourself.

-Ed

 

... and no knock board... and no IAB circuitry. This is NOT a P72.

 

It's been chipped but can't tell if J1 is open or closed. J1 as to be closed to activate the chip. If your engine is non-VTEC you just need a tune.

It's easier and more common to convert this ECU to P28 spec rather than P72 spec.