I am going to put a low pressure cutoff switch on my 71Z. I got a brass T and a nipple from Home Depot. I can not get the nipple threaded in the block. It threads into the T fine. The oil pressure sender threads into the T and the block just fine. The nipple just won't go in the block. I held the nipple and the oil pressure sender up, side by side and the threads look the same. Same pitch, etc. I don't get it. Has anybody had any trouble like this or have you used something else? Thank you, TimsZ

I happened to write this down a couple of weeks ago. I knew it would be useful. The thread in the block is British. "BSPT". Sorry, I don't remember who shared this with us. Thanks. Here is what I wrote down. Search bspt on McMaster Carr.com. #5832T121 BSPT to NPT threaded brass nipple, 1/8 pipe size X 1 1/2" threaded both ends Sch40. Hope this helps you out.