87 R30 7.4L Oil pressure gauge sender

[Classman]

Hi to all, New member in Australia. Looking for some advise on best quality oil pressure gauge sender.. have 2 now that leak ( original unknown brand and Standard motor products ) In all fairness, it may be because the replacement crate engine has up to 75PSI at idle ( cold ) and latest sender is 60PSI. Has worked fine for about 2 years but now leaking, fluctuating occasionally, and hanging at mid range reading when engine shut down. Ignition turned back on and gauge drops to lower mark.
I'm currently using a mechanical gauge and have checked the original gauge, wiring and connector and found all ok.
I found GM information that shows ALL the sender units are the same for the 60, 80 and 100psi gauges. All have the same Ohms figures at low, mid and high gauge marks.
Would like to know if anyone has found a sender that will handle the extra pressure, without leaking, OR if someone has used an 80psi sender with the original 60 psi gauge....Appreciate any information... Thanks