Swapping 502efi for 525efi

[endeavor1]

Converting a Black Thunder from 502/540efi engines to Merc Racing 525 efi. Does anyone know of common issues that may arise in this swap. I m worried about electrical connections and sending units to the new livorsi guages. Everything worked for the 502/540s.

Any help would be great!!!!!!!!!!!


Thanks in advance, JCB

[Pismo10]

I have heard lots of gauge trouble. Need a certain cable to convert. Maybe the new Livorsi's will be compatible already.

[ivanex502mag088]

please be so kind to inform me if someone has mercruiser 600 sci and also where I can download users manual for it and buy used engine for reparation .

Thanks in advance

[Bradz]

Should be plug and play. Standard wire harness plug worked fine on my Skater that was converted to 525's from big blower engines.

[Tyler Crockett]

If you had a 10 pin harness and the new 525 has the 14 pin I have some adapter harnesses.

[bigboat28]

What are you doing with the 540's?