I have a 1988 Chaparral 198 c xl. The fuel sending unit is gone and I need to replace it. I pulled the old one. It was made by Medallion Instruments Inc. It appears the model number is B-1321. It is 240 ohm. Medallion no longer makes this product and I can not find what replaces it. If someone could give me a hand that would be great. Thanks - Chad. I have attached a picture of it.