I replaced the fuel gauge in February 2015. I called the manufacturer and was referred to Titan Machinery, 641-628-2131.
I think they are the same except the length may vary on the water tank. Their Part number was 60109001cost 74.77 plus freight. Very nice people, they thought it was cool to sell a part for a sailboat.
I replaced mine with a unit from WEMA (wemausa.com) I believe it was the SSS / SSL line. You have to order a specific length - I measured the length (depth into the tank) of the old unit and used that.
We replaced our water tank gauge with the WEMA, like others have said:
They are the same bolt pattern. Just be very careful to NOT drop the tiny bolts.
One disappointing aspect of my WEMA water tank gauge is that it is not linear. It seems to have a set number of indicators and what I observed is that the tank gauge will show 3/4 full, for example, and stay there for a while, like a day or two, then POOF....it next shows 1/2 full. It never shows a linear drop in water, it shows stages. My old float type was linear. Just a heads up.
So, you pull out the old one, then measure the depth into the tank to the bottom, and make sure you buy the longest one that will fit without hitting the bottom. That is how you measure the tank.
Unlike Haden’s gauge that has a flange with holes, our 1999 IP45 has a threaded Wema gauge. Those threads are a DIFFERENT size from what is currently available from Wema! I’ve had many conversations with Wema about this, and the results:
1. The current thread size was adopted about 2000.
2. No old thread-type gauges are in stock.
3. Perhaps a long-time distributor has one? They provided me names and numbers for distributors in USA and Canada. I called them all, and none had any.
4. My current unit is not repairable.
5. I would need to modify/create a new mounting for a new gauge.
Well, I figured out already that the sensor on my IP420 is threaded and screws in. The problem is - my boat was built in 1999-2000 and no one at the factory can shed some light regarding the thread used then...