Help - 110 FFR

Hi, I have just changed my engine as the old engine died, lucky I found a reconditionned mod 2.5, runs great BUT firstly I have one red wire conming from the bulkhead on the left hand side (that is looking from the front) I have no idea where it goes, my oil temp gauge registers minimum but does not go much higher. Another problem is that when the ignition is on the left indicator stayed on - but not flashing, I removed the relay on the far right and now the indicators work - What is this relay I removed.
Look forward to hear from you
regards Anthony

Pics?

Oil level sensor ( on the oil filter housing )
Injection pump ( it wont start if that's not connected )
Water temp sensor ( at the front of the engine near the top )

All these 3 are fed by the loom which plugs in just below the fuel filter

Glowplug feed ( shortish thick cable )

The only cable i know that comes direct from the bulkhead.

That's all there is on the left on the engine, the remaining wiring for the lights runs through the wing and not near the engine bay.

Can't think of any other wires on that side...