Senders are sensors for measuring Vehicle Speed, Coolant Temperature, Engine Oil Temperature, Oil Pressure, Fuel Level, plus Adapter Plates, and Bushings, etc.

Classic offers all of the senders described here:

View all our available senders, and place your order online.

Pulse Signal Generator

The superior coil resistance of the Classic Pulse Signal Generator delivers a clean, sharp pulse. These Generators are available with a choice of fittings to connect directly to most metric, GMC, Ford (from the early torque-tube type speedometer drives to the latest electronic automatic overdrives), and some Chrysler transmissions.

The GM and early-Ford type (right) or the later Ford-type (see below) Speed Sensor will usually have sufficient clearance to allow mounting directly on to the cable takeoff of the stock transmission or onto the closed-torque-tube of early Fords. Using this type of sensor can eliminate completely the older flexible mechanical cable.

If your installation has a clearance problem (exhaust pipe, frame cross-member, etc.), our 18" Flexible Cable Kit can be ordered that will allow the Sensor to be mounted remotely.

Porsche or VW with front-hub cable drive will use a 48" flexible cable and the Classic remote-sensor (the type of cable tip required to fit VW-Porsche will be similar to that shown in Photo 1 below and labeled "VW-Type").

The image above shows the Ford-type Speed Sensor that can be used on most Ford transmission since the mid-60's.

It is designed to plug directly into most C4-C6, Mustang, Cobra, and other similar transmissions having a plug-in hole.

This unit will generate the 8-pulse per revolution ( 8,000 pulses per mile ) signal required to correctly operate your Classic Speedometer.

Magnetic Proximity Sensor

The Magnetic Proximity Sensor will respond to pulse signals across a 1/16" air-gap between the sensor tip and disk-rotor, IRS-CV joint bolt-heads or notched brake-drum edge.

It is useful on trans-axle setups or transmissions without mechanical speedometer cable connection.

Using a stock GM Speed Sensor - 700R, 4L60, etc. Our Speed Pulse Convertor Box is used on late model GM 700-R or 4L60 over-drive transmission applications with a GM VSS (Vehicle Speed Sensor). This Convertor Box will convert the signals from the stock GM-VSS so your Classic Programmable Speedometer will read and operate correctly. The original GM-VSS signal can still be used to operate your fuel-injection, engine monitoring, transmission shift points, etc.

Tachometer Filter Our Tach Filter is supplied with most Classic Tachometers. Installed between the Tachometer and the Ignition Trigger Source (usually the coil) this filter traps, redirects, and dissipates the high voltage spikes and surges that are emitted by any late-model high-energy ignition system.

It also modifies the sharp up-and-down spikes into a semi-square wave signal for steady pointer readings and faster pointer response. Three color-coded wires allow for fast and easy fool-proof connections for life-time protection and superior response on all Classic Tachometers.

Pressure Sender

This movement utilizes the latest "flat-card" electronic technology for maximum reliability and accuracy under adverse operating conditions of heat, vibration and acceleration.

It also assures a steadier pointer movement even under the most demanding conditions.

The Oil Pressure Sender base thread is standard 1/8"-27 NPTF, anodized steel bell-case (left above) or optional chrome-plated (right above).

Pressure-tested to 300 PSI and available in 100 PSI (240-33 Ohm).

Temperature Sending Units

All Classic temperature gauges require the correct Sender Unit from Classic Instruments.

Senders are available in standard threads as pictured at left: 1/2" (A), 3/8" (B), 1/4" (C), and 1/8" (D) NPT self-sealing tapered threads to fit most stock or aftermarket intake manifolds.

VW Oil Temp Sensor Kit--(E above).

The VW-Type Oil Temperature Sensor includes Sender, Metric adapter plug and VW Sealing Gasket. It installs without modification into the Oil Pressure Relief Plug opening found on most air-cooled 1960's-type (flat-four air-cooled) VW engines.

It is not for installation in the Oil-Drain Plug Opening! Most VW experts agree the oil pressure relief plug opening in the engine block (behind the rear cylinder on the drivers side (U.S. Left-Hand Drive) is a better choice for oil temperature sensor location than installing in the dip-stick tube or in the oil pan drain opening.

Oil Pan Temperature Sensor--(F Above).

The temperature of engine oil in the oil pan can be monitored with our Oil Temperature Sender and gasket. It replaces the stock drain plug (1/2-20 thread) on most GM and Ford engines.

Pressure Sender Bushing Kits

Our brass angled-bushing kits allows for easy installation on most GM or Ford engines.

The Oil Pressure Sender will not clear either the back of the intake manifold or the distributor body on most GM installations unless the Bushing Kit is used.

Tank Adapter Flange

Adapts early Ford (1936-1956) six hole tank openings to the standard aftermarket five hole pattern.

It includes a computer machined aluminum adapter plate and six counter-sunk phillips flathead stainless bolts.

Classic Fuel Tank Sending Units

Classic Instruments manufactures several tank senders to conform to most OEM (original equipment manufacturers) electrical resistance specifications.

Classic also assembles many of its fuel gauges to read correctly when connected to the original or stock tank sender.

A chart is provided below to assist you in determining what tank sender you probably have in your vehicle.

Refer to the chart when choosing the proper resistance range of fuel gauge to connect to your specific tank sender.

Selection Chart for Fuel Senders

If Gauge is:	Ohms Empty	Ohms Full	Use Classic Sender:
GMC 1964 or earlier	0	30	Sender SN36
GMC 1966 and later	0	90	Sender SN38
Ford - 1987-later (Unleaded Fuel only)	16	158	Not Available at this time
Ford (pre-1987); AMC	73	10	Sender SN39
Toyota-Nissan 1985 and later	90	0	Sender SN38 - mount movement Upside-Down
Stewart-Warner	240	33	Sender SN33 or SN35
Auto-Meter	240	33	Sender SN33 or SN35

Fuel Sender - Deluxe Stainless

The Deluxe Fuel Pick-Up Tube Sender (shown at left) features a stainless-steel mounting plate and 3/8" OD (outside diameter) x 13" long stainless pick-up tube (shorten or extend to match your own tank depth).

It includes a cork gasket, five self-sealing mounting screws, and instructions. It is designed with new heavy-duty flat-card technology resistance movement for greater accuracy, reliability, long-operating life and resistance to road-vibrations.

The sensor housing easily rotates a full 360 degrees on the stainless pick-up tube to position the float in any direction to clear internal tank baffles, side of tank, vent lines, etc.

The Deluxe Model is available only with the aftermarket standard 240-33 Ohm Heavy-Duty Sensor Movement at this time.

If another resistance range is required, choose from our Standard Model Fuel Senders shown below.

Standard Fuel Sender

Our Standard Model is designed to operate correctly with any Classic 240-33 Ohm fuel gauge.

It easily adjusts to tank depths of 6" to 24" with the standard five-screw mounting pattern.

It includes cork gasket, float assembly, mounting screws and instructions.

Other Resistance Ranges are available as an option in the Standard Model configuration to match early or late GM, Ford, Toyota-Nissan, Stewart-Warner, Auto-Meter, and other aftermarket fuel gauges.

It is designed to match tank sender openings with a minimum 1-1/2 inch center hole surrounded by a standard aftermarket 5-hole offset mounting bolt pattern.

Gear Selector Sender

Used for both GM & Ford applications, OD & Standard. Box measures 4 3/8" length, 3 1/4" width, and 1 3/4" Tall. With the bracket the unit is 9" long.

Wiring Harness

This wiring harness is available to help you wire up your gauge set.

The harness has connections for up to six gauges.

The wires are labeled and color coded to help ease the process of wiring.

Quick-disconnect connections allow for easy instrumentation removal for under dash work.

View all our available senders, and place your order online.