19xx. p80 ECT measurement temperature vs resistance

[abscate]

Courtesy of Mike (precopster)

As these 3 items closely determine coolant temperature they should be OEM. The temp switch may be out of range and can be tested in a pot of water. Here's a table of correct values for the temp switch

0 degrees - 5740 Ohms
10 degrees - 3700 Ohms
20 degrees - 2450 Ohms
40 degrees - 1150 Ohms
80 degrees - 318 Ohms
100 degrees- 184 Ohms