usually gauges and senders are made to work together to register correct pressure. i might expect a mismatched set to show too low or too high, but not an accurate amount of pressure. IIRC, there's an 80lb sender available too, if it were me, i'd try one of those (
https://www.ebay.com/itm/39176118369...tion=view_item ) and seriously consider purchasing one of these too...good luck.
https://www.walmart.com/ip/Oil-Press...ionGroupCode=1