almost thought i had some real problems
oil pressure gauge started reading 0 when warm. at ideal
had two older senders swaped then in one didnt work the other worked but would not go above 35 or below 28
bought new sender. 38 bucks installed worked didnt really read high on cold start just mid say like 45-50
and when warm 0 on ideal. got adapter 1/8 bspt to 1/8 npt
installed real gauge so far all looks well
almost 90 on cold and around 11-13 when warm

owned a few .. current 86 rustbucket 2.5td . manual hubs