Great thanks - I'll go down and measure it all/take some pics. (Luckily the tank is empty!) As it happens I mailed Coastal Rides an hour ago, no doubt they will ask what type it is too!
The gauge is a small black box with 3 leds and a push button on it.
Now you worry me! It looked easy - lifted a floor panel and there it is...
We're changing the toilets to electric ones next week anyway so might as well.
1 you have to physically remove it. If it is just a floor panel you are most fortunate. I have never owned anything close to that it would be major surgery. This will also require all hoses that have been there for 20 years to be removed and most likely replaced
2 you have to now get large tank physically out of the boat which depending on doors may not be easy
3 you have to get a new one made and pay for it and install it with a new sender. Wire the gague etc