I tried several variations. The key IMO is to stop using the Alternator signal to drive the tachs. You can get a Hall effect sensor cheap. I got 4 for $12 from Amazon. I just made a small bracket on the front of the engine and epoxied two strong thin, round magnets to the balancer. Wiring is simple. From there you can drive nearly any tach you want and it will be much more accurate. You can even drive your original alternator W signal tachometers using the Dakota tach adapter for $99. You can get an ultra accurate Aetna gauge only for around $300. Or a Faria, VDO or other tach from $50 to $150 and probably wont need the Dakota adapter. IMO you have to start with a hall effect sensor mounted on the front of the motor.
I bought some Aetna Tachometers and the starboard side takes a while to get up to speed and sometimes never does. When it does its about 112 off of the port engine. I have 2 upstairs and 2 downstairs and they both read the same. I have Lehman sp225 engines. Any ideas on troubleshooting? I really appreciate it if you do.
Depends on where the Aetna tachs are getting the signal? Are you using the tach drives off the Lehmans or maybe a pickup off the flywheel? I would suspect its an issue at the pickup since both gauges are reading the same. See if you can tell what your system is using to send the signal on that side. If its the flywheel teeth style you might check the clearance between the flywheel teeth and pick up as well as clean the tip. If it is the tach driver you can swap the drivers from left to right and see if the issue follows the driver. Of course if it follows the tach driver then that would be the problem. Your signal could be W signal from alternator as well but I would doubt that. Let me know.
@@DustinKaufman-i2q perfect. Check the gap. For flywheel pickup that is semi critical. It usually screws in or out with a couple of jam nuts. Also clean the tip.
