The “Speed Relay” comes in a few versions for early Porsche depending on whether the car had Carburetors (911T and certain 912 models) or MFI (911 E,S).  This device is found on the engine electric panel. It monitors engine speed and on closed/trailing throttle situations it cuts off the fuel supply until the rpms drop under approximately 1700.  This conserves fuel, improves emissions and serves to reduce exhaust “popping”. The most common problem with these units is component failures due to vibration and corrosion resulting in mechanical failure of the component leads.  It is not uncommon to shake these units and actually hear parts rattling around loose inside!

Send your unit into me and I will clean it up, repair and replace components as needed and fully test it.  

Repair Cost is $99 plus shipping.

TWIN-SPARK  Ignition Modules:

Developed for high performance twin spark plug Porsche 912 engines, (and similar applications) this product solves the problem of spark synchronization.  Precise physical manipulation to equally match the gap and positioning of two sets of distributor points is no longer necessary. This unit synchronously drives two isolated Coils (1.5 to 3-Ohm) from a single ignition signal (one distributor points or common points-eliminator module) eliminating timing differences of the ignition event. Each coil gets full current.  $199 plus shipping

A high-energy version of the Twin-Spark Module is also available.  This unit uses adaptive dwell control to drive coils with resistance as low as 0.5 Ohms without excessive coil current.  Low resistance, low inductance H.E.I. coils provide a longer, high energy spark duration and allow larger plug gaps for firing lean mixtures. $299 plus shipping


Developed for Tachometer rebuilders, this postage-stamp size PC-Board module replaces the old electronics in vintage VDO (as well as many other) tachometers.  Especially useful for replacing failed electronics, converting Tachometers for different engine cylinder counts, or re-purposing a Tach with a new face and expanded display range.  For example, converting a 4-cyl, 7K rpm Tach to a 6-cyl 10K rpm Tach. 

This module accepts high level (~150V) signals from traditional points/coil ignition as well as discrete low-level (5 – 14V) engine speed signals from modern engine management systems.  The unit outputs a linear rpm/voltage that can be scaled to drive various analog meter movements commonly found in most tachometers.  (This unit is not for stepper-motor movements.)  This module is available in single quantity for $49, or in jobber lots of 10 pieces for $350.

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