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Discussion Starter · #1 · (Edited)
Hello all. Today I installed an oil pressure gauge and volt gauge on my LT155. I've owned this tractor since new (bought in 2001) and it now has 363 hours on the clock.








Daman1 gave me the inspiration and encouragement to tackle this job.

Here goes:

I decided to go with Sunpro's 1.5" triple gauge set (temp/oil pres/volts) All I really wanted was the oil & volts--the mechanical sender on the temp gauge is too big to try and adapt for an oil temp gauge, so I just gave the temp gauge to the kid to play with.

Here's where I originally thought I would mount the 2 gauges:








However, once I actually had the gauges in hand, I found there wasn't going to be nearly enough room.....after lots of agonizing and fiddling, I decided to put them here: (holes already cut)








I used a 1.5" hole saw and opened the hole up a bit more with a dremel.

Here are the gauges during a test-fit:








Okay, that should work. Wiring up the voltmeter was pretty easy--I had installed an hourmeter when I bought the tractor, so I had a good source for a key-on hot and ground.

My sweaty-pits dilemma was the oil pressure gauge. It seems like most full-pressure Briggs motors have a nice 1/8NPT port ready to go for a job like this. My Kohler CV-15 wasn't drilled and tapped for a pressure port. In this pic I've already punched my target for drilling:








For me, intestinal fortitude is taking a drill to a perfectly healthy Kohler engine and putting a hole in the oil filter housing. But, no guts, no glory, so here we go:








Too late to turn back now, grab that 1/8NPT tap and have at it:









A test with the fitting was a go. Fitting and hose installed:








Finally, all buttoned up...test fire...and it worked!!! No leaks, decent pressure. Yay!









It's interesting, cold start up shows 40 psi. Once hot, full throttle is just a hair under 40 psi. Then, hot idle shows 30psi.








Another interesting tidbit--when mowing on an incline--if the mower is leaning away from the oil filter side of the motor, pressure drops 5 psi. Mower leaning towards the filter side, no change. Interesting, but I don't know what it means....

A few other shots....here are the gauges with the backlights on (wired in with the headlights):








And a gratuitous shot of the hourmeter installed in the frame:









All in all, this was a really fun project. The gauge set is $30 at your local Autozone. I had to buy an assortment of electrical connectors, a 11/32 drill, the tap.

Once you're done, you have something that even the GT and X series Deeres don't have-actual gauges! (At least none I have seen.)

Greg
 

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Whoa! Very nicely done! I love knowing what is going on inside these engines and more importantly, if something is going wrong!:fing32::thThumbsU:trink39:
 

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Once you're done, you have something that even the GT and X series Deeres don't have-actual gauges! (At least none I have seen.)

Greg
Very nice work :congrats:

I did the same on my X300 last summer :D Click Here




It's normal when the engine is hot to lose a bit of oil pressure. :fing32:
 

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Hey GD9704, I want to do this to my LT155. How deep did you need to drill the hole in the oil filter housing? I have tapped many holes before so that won't be an issue for me. I installed a light switch for my headlights to turn on whenever so and it is located right where your Volt guage is. I may have to find an alternate spot. Overall, ver nice and clean installation!!!
 

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Discussion Starter · #7 ·
Hey GD9704, I want to do this to my LT155. How deep did you need to drill the hole in the oil filter housing? I have tapped many holes before so that won't be an issue for me. I installed a light switch for my headlights to turn on whenever so and it is located right where your Volt guage is. I may have to find an alternate spot. Overall, ver nice and clean installation!!!
Chucho311: Thanks for the kind words. If you take your oil filter off and look down at the housing, you'll see where you need to drill through--it's probably a good inch plus. Here's a shot looking down on the housing. I've drawn red lines to show where you're drilling under the filter intake port (left side hole.) You just have to be sure you're drilling straight and level. The hole exits in that bowl behind the filter threads....be sure to stop before you start drilling the return port, which you can see in the middle of the bowl heading back into the engine. (I only nicked it a bit! :fing20: )






Chris W: I knew this was possible because in Kohler's Command Pro manuals, they show that spot drilled and tapped with either a low pressure shutoff switch installed in the port or plugged. For some reason, John Deere didn't want to spend the extra buck to have my engine done!
 
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