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Ok im going freaking crazy trying to figure out what size plugs I need. On my block there are 4 holes on the bottom of block. On my other engine i just yanked there are brass plugs with a flat head screwdriver top. Of course none of them will come out and ive jacked them all but one. Not sure what the hell they are there for, but the very front one is for the oil pressure gauge and the rest of them get blocked off. Ive measured the sensor that fits at the hardware/automotive store and it comes up metric 10 1.0 but bold doesn't fit in block. 1/8 brass plug doesn't fit. I went to machine shop they said it sounds like british pipe thread. I really dont want to tap this thing. Just wanted to see if anyone has messed with these at all. Think machine shop i used before took them out.

Thanks
OX

They are probably metric. I don't know of the town you are from but in one of the bigger cities on CA you should be able to find the metric or British plugs being that there are a lot more classic Imports in those areas.