We struggled to find a cost effective one when we coded the Ocean, eventually found a neat piece of kit from a company called Cruz Pro (from New Zealand - hadn't come across them before).
The UK distributor /stockist we used is Energy Solutions - really helpful
Energy Solutions - Cruz Pro Instruments
IIRC was £50 mark...we bought the one with the seperate sensor and mounted the gauge on the dash....works too, as I found out when my sender unit plate worked a bit loose on top of the tank....and is still going strong with no issues.....