I know this is an old post but I just bought an rz-0159 to replace my rz-0132 ecu fuel relay. Now I know about the soldering trick. All I need to know is how to wire them up as the plus are different. On my rz-0132 I have pin 6 missing and on the rz-0159 with pin 4 missing. I'm sure it's a matter of testing and finding the correct swap but can someone verify.

 

Or do I just swap 4 and 6 around...the whole plug is different so I might have to use terminal connectors and rewire...o I suppose buy the correct plug

 

Ok to answer my own question yes all you need to do is swap 4 and 6 around. The plug is different an will not fit so until I buy one and join up the wires I have just used terminal connectors...rough I know but at least I know it works. The engine check light came on first time around but that was because I had the black/yel and yel/black on the wrong terminals. I swapped over and all good...now to buy myself a new alternator but its a tight squeeze in my 1980 mini leyland so I might get the old one rebuilt.