I've been experiencing erratic engine speed under load on my LX565 with N844 engine. I finally figured it out but it took much longer than it should have. Below are my steps to help others trouble shoot.
1. Possible fuel / air delivery problem:
a. Replaced both fuel filters
b. Checked...
I had a similar condition with my LX565 dash not working. I decided to remove the electronic dash and fabricate a new dash with standard gauges for fuel, hour meter, hydraulic temp, voltmeter, oil pressure, engine temp and RPM...
I've spent some time getting the parking brake to operate correctly on my LX565. The brake components are quire expensive from the dealer so I machined my own brake pads (1 per side).
Here is a link to the LX565 Brake Puck - PLUG 9829942 drawing...