hurstscrambler Posted August 5, 2017 Share Posted August 5, 2017 I have a 1968-1969 Cummins NHCT-270 in an off-brand truck, it seems to have a regular old PT pump on it. The factory mechanical tach is junk and I would like to get a new Stewart-Warner to replace it. Is there any way to tell if I need the 1:1 type or the 1:5 ratio? I'm totally clueless as to how I would figure this out so, I'm hopeful that someone here has run into this. Thanks in advance, Andy Quote Link to comment https://www.bigmacktrucks.com/topic/50689-cummins-tach-drive/ Share on other sites More sharing options...
j hancock Posted August 6, 2017 Share Posted August 6, 2017 IDK, if no one else chimes in, try Mahoney's in NH 603-642-8483. They used to advertise still having parts and knowledge for older Cummins and PT pumps. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/50689-cummins-tach-drive/#findComment-376766 Share on other sites More sharing options...
hurstscrambler Posted August 14, 2017 Author Share Posted August 14, 2017 I'm glad you brought them up, I will probably give them a ring next week. I was trying to remember them before, when I was after parts. They seemed to be a good, old school shop. I may bring the truck up there when it's done and have them check the engine over. Thanks, Andy Quote Link to comment https://www.bigmacktrucks.com/topic/50689-cummins-tach-drive/#findComment-377434 Share on other sites More sharing options...
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