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Sorry if these seem a bit dumb and I have been searching on google for the answers but I've got some free time this weekend and I thought it better to just ask the knowledgeable folks on here because I'm not finding much maybe just thick. I can't find out where the single pinned e30 temp gauge sensor wires into the m52 engine side loom. I'm thinking it goes onto the engines gauge sender? Although I can't see a single sensor on the M52 engine that looks as though its just for the gauge. So I'm guessing there is a sensor that goes to the gauge in an original M52 car that does other things as well and has a few wires coming out of it? Is the idea to find what ever sends the info to the gauge on the engine and cut that off and connect it to the e30 sensor so it gets the feed from there? Also really amateur mistake I made. Just disconnected the positive and negative cables on my E36 donor and didn't mark any so now have no idea where the cables go to on the battery posts in my engine bay... The one that comes from my E30 fuse box, does that go to the positive post? There are two more coming from the engine side loom I have no idea where they go. Are they all positive cables? And the battery is simply just grounded with one ground strap? here is a picture: I marked the cable that connects to the alternator but just to make sure I'll ask here... Does the alternator and the starter have a thick cable connecting the two? If so, does there need to be a thick positive cable coming from the positive battery post running down to the starter solenoid? Thanks for helping a dummy get his engine swap sorted.