Jacobsen HR5111 tachometer problem

aa777888

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Hi all, newbie Jacobsen owner here. Just picked up a 2005 HR5111 with 2200 hours. Going through it with a fine tooth comb.

Problem: when increasing the throttle the tach seems to track perfectly until about 2400 RPM, then as the throttle is advanced further the tach needle drops down to 500 RPM and stays there.

I'm guessing it's a bad speed sensor, but before I drop $100 on a new one as a guess, if anyone has any feedback on this issue that would be great.

Thanks!

aa
 
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