E-commerce: Product/Category List

SMi™ 'Stepper Motor' Panels

2 Gauge Aluminum Panel with AccuTech™ SMi™ Gauges & Tach - OP,WT
Click image to enlarge
2 Gauge Aluminum Panel with AccuTech™ SMi™ Gauges & Tach - OP,WT
Part #: 52-44470
Gauge / Tach Options
'Stepper Motor' Racing Gauges and Tachs
The next generation in instrumentation

SMi™ Stepper motor gauges use a small electronic motor that only turns a tiny fraction of a rotation to drive the pointer. It is electronically controlled and is much more precise than the traditional mechanical instruments whose accuracy can be affected by many factors. Many professional race teams - NASCAR™, etc. – are switching to this style of gauge for the improved accuracy (see the in-car cameras). Approved for use by IMCA™.

Built-in Warning Lights – Ultra Bright 2 Stage LED
2 set points are easily adjusted to your needs (critical oil pressure has 3 set points). For example set water temp for just above normal running temp (if you run 215° set it at 230°). Above that the LED comes on to let you know the motor is starting to get warm. Set the second one at the max temp your engine can tolerate (say 250°). At this point the LED flashes to attract your attention, possibly saving motor damage.

Since oil pressure is so critical it has 3 set points.
You can set the first just below normal running pressure (say normal is 60 psi – set it at 50 psi – no damage there). At this point the LED comes on. Set the second at 35 psi. The LED flashes – you need to know here, possible damage. Set the third at 20 psi. Engine damage is likely here. At this third set point the LED continues to flash PLUS the gauge backlight starts to flash. It’s hard to miss this – day or night. It allows you to get the engine shut down before it blows up, saving you $$.

The Gauges

  • 2 Gauge panel with OP 0–100 psi and WT 100°-280°
  • Gauges are 2-5/8” and have a molded polycarbonate / ABS case (virtually unbreakable)
  • An electronic sensor (incl.) is installed on the motor to drive the gauge - no oil or fuel in the driver’s compartment for safety.
  • Thru-the-dial LED backlights and an illuminated pointer make these easy to read at any speed
  • ”Presentation” at turn-on - Gauges go through a self test. Pointers swing full scale and all LEDs come on
  • Great looking Aluminum Panel - black anodized with clean, modern graphics - pre-wired and ready for installation
  • Can be used with 12 & 16 Volt negative ground systems with or without an Alternator

The Tach

  • Maximum RPM recall - Just push the Recall button
  • High RPM Warning light - 2 stage - First warning can be set for just over your normal maximum RPM, the second stage at the redline. You get a warning of too many revs before you blow an engine. Can also be used as a 2 stage shift light.
  • LED back light - Back light shows through the dial face PLUS the pointer is LED illuminated to make this the easiest tach to read - and super sharp looking too
  • Stepper motor precision tach at an affordable price

When using HEI or stock-style ignitions systems, a tach filter is needed. You can find that filter here: 52-44410 

California Proposition 65 Statement


  Brand: AccuTech™ SMi™
  Style: Stepper Motor
  Type: Electronic
  Size: 2 5/8" diameter
  Face Color: Black
  Bezel Color: Black
  Pointer Color: Red LED illuminated
  Oil Pressure Included: Yes
  Oil Pressure Range: 0-100 psi
  Oil Pressure Sensor Wiring: 5' lead length
  Oil Pressure Sensor Fitting: 1/8" NPT
  Oil Pressure Power Draw: 61mA @ 12v
  Water Temperature Included: Yes
  Water Temperature Range: 100º-280º F
  Water Temperature Sensor Wiring: 6' lead length
  Water Temperature Sensor Fitting: 1/2" NPT
  Water Temperature Power Draw: 62mA @ 12v
  Oil Temperature Included: No
  Fuel Pressure Included: No
  Voltage Gauge Included: No
  Tachometer Included: Yes
  Gauge Backlights: Blue
  Gauge Warning Lights: Yes
  Run on 12v System: Yes
  Run on 16v System: Yes
  Brand: AccuTech™ SMi™
  Style: Stepper Motor
  Range: 0-10K RPM
  Memory: Yes
  Size: 4 1/2" diameter
  Face Color: Black
  Bezel Color: Black
  Pointer Color: Red LED illuminated
  Backlight: Yes
  Tachometer Power Draw: 106mA @ 12v
  Weather Resistant: Option available
  Material: Aluminum
  Finish: Black anodized
  Gauge Panel Dimensions: 11 7/8" x 4 5/8"
  Sensors Included: Yes
  Wiring Included: Yes
  Pressure Sensor Adapter Included: No
Replacement Parts:
  Pressure Sensor - 100 psi: PN 43520
  Pressure Sensor QD 'Pigtail' Wire: PN 43530
  Pressure Sensor Adapter: PN 43525
  Temperature Sensor - 280° F: PN 43500


AccuTech™ SMi™ Gauge Overview

AccuTech™ SMi™ Oil Pressure Warning In-Car Video Testimonial

This last race some debris came up and knocked the dry sump belt off the pump. Thanks to my new Longacre SMI gauges I got her shut down in time before destroying my motor. The oil pressure gauge blinks like crazy when the third warning setting goes off. Thankfully that got my attention in time to shut her down. Now we are just looking at new bearings and a light polish job.

I think that with the pressures of running up front in a big race I would have missed the little warning light on my old mechanical gauge set.

Thank you SMI Gauges!
Gary Lewis

Related Products