Can I mix Stewart Warner gauges with senders of another make, or vice versa?

Generally no. If mixing is intended, electrical characteristics must be determined in advance of installation to insure compatibility.

Pressure Systems:

Both gauge and sender should have the same impedance to be a perfect match. For best overall performance, we recommend that you use Stewart Warner gauges and senders together.

Other manufacturers will specify that their gauges work with Stewart Warner senders. We don't sanction the mixing and matching but in some cases, their gauges will match our pressure senders.

A 240 ohm gauge should be matched with a 240 ohm sender.

Fuel Level System:

Fuel systems are quite the same as pressure systems. Gauge and fuel sender must have the same impedance to function correctly and both should be at the same ground potential. For best performance, Stewart Warner suggests that you purchase our matching gauge and sender combination.

Water Temp System:

This is the most difficult system to match. Most temp gauges are designed to work with one particular sender. Each sender has an electrical element with its' own characteristics. It is very difficult to find another manufacturer whose gauge dial angles will match the senders resistance/temperature curve.

When trying to match temp gauges and senders of different manufacturers, the most critical point on the gauge is the thermostat temperance. If this combination produces a reading that is with-in 5º F of the thermostat temperature, and it stabilizes there, then this combination can be used until you can purchase the gauge and sender combination that was designed to work together.