Purchased an NOS tach on flea bay a while back. No paperwork with it. Has a sending unit with it and some br*** screws and a steel wire? attached to an aluminum flange. The grey cylindrical unit on the aluminum bracket is magnetic. Not sure if it's all there. And no idea if it will work on a 6-banger. Anybody out there familiar with these? The sending unit has 2 wires, both grey. The back of tach has 2 bare lugs.
This is older technology from the 60's I believe. I've done a search already, many older tachs operated this way.
He, he....I thought it was a vibration sensor type for diesels, and figured the 6k max would be for the Detroit hi rev motors...but no....but it was a close guess: That coil is placed near the boat flywheel, no wires to engine. So the ad says. It did not mention that antenna .
It is a marine tach. That number is for single engine boat with inboard motor. ...and look close at first ad with a different model number; But look at the antenna? or is that the coil itself????
Wounder if the RPM are triggered by a magnet installed on the balancer -flex plate /flywheel , The white pice looks to be the pickup.
Since it reads flywheel rpm, it won't matter if it's a V-8 or inline 6. Stick a magnet to a bicycle wheel and hold the probe up close to it. The needle should start to move as the magnetic pulses trigger it.
My lathe is down so I went to a buddies shop. Put a small ceramic magnet on OD of chuck. Ran it at 600 rpm, tach reads 600. Good to go.
The Jalopy Journal
