Here is the feedback I received from Noland Engineering:
Oil Press(0-80 psi):
Atypical 80 psi American Sender should have a resistance to ground of 240Ohms @ 0 psi. If the Sender is connected to two gauges (Dual Station), itmust be half this resistance or 120 Ohms. The most accurate way tomeasure Sender resistance is wit it disconnected from the gauge(s). Yourmeasured value is about 100 Ohms, which isn't far from the expected 120 Ohms.
WithIgnition Key 'ON' (gauges powered) and engine not running (Oil Press = 0), Iwould expect a gauge voltage of about 6v. Start the engine, and assumingthe Oil Press goes up to say 50 psi, the gauge voltage should drop to about2.5v. So, these are the cal values I would use:
SenseV1 6.0 DispVal1 0
SenseV2 2.5 DispVal2 50
Eng Temp(100-220 degF):
Themost common American Sender for this range is 450 Ohms @ 100deg, whichtranslates to 225deg for a Dual Station Sender. Assuming your engine wascooler than 100deg when you measured sender resistance, your value of about 250ohms isn't far from expected.
So,let's assume that 100degF yields a gauge voltage of about 7.3v. You canverify this during engine warmup by checking the gauge voltage as soon as yourgauge points to "100". The 2nd point should be obtained asclose to normal operating temp as possible. With Diesels, this isdifficult unless you can put them under heavy load. If you can warmyour engine to say 175 deg, I expect the gauge volts will be about 3.0v. I would therefore start with these cal values:
SenseV1 7.3 DispVal1 100
SenseV2 3.0 DispVal2 175
Fuel Level(WEMA Sender):
Sinceyou didn't include a Sender Curve, I'm just going to assume it's astandard 240-33 Ohm American sender. Also, I assume it's notconnected to a gauge, which means you must have A3 "Sender Currents"ON (blue Dipswitch). This results in the following ideal calibrationvalues:
SenseV1 2.2 DispVal1 0 (empty)
SenseV2 0.3 DispVal2 100 (full)
Ishould warn you, however, that Fuel Senders rarely travel their full range wheninstalled in tanks, so the real "Sense v1" might be say 2.0vwhen empty and/or "Sense v2" could be say 0.5v when full. Also,since it is rare to completely empty a tank, you may have to get the firstcalibration point at say 1/4 tank (25%) or 1/8 tank (12.5%) or whatever else isconvenient.
Tran Press(0-400 psi)
Theonly American Sender I have for this range is a1-88 Ohm for 0-400 psi respectively. This doesn't agreewith your measured Sender resistance of 75 Ohm, which I assume you took at 0psi (engine not running). So this one will have be be determined by bruteforce. I would get all the others dialed in, then we'll work on thisone.
